Having your S/B/R splits would help.

Age? Weight? How long in the sport? How many hours per week do you train? Bike setup?

Age 48; Weight 158 pounds this morning; 10 years in the sport, first IM 2015; 9-12 hours per week training; 2009 Cervelo P2 with HED deep-rim front wheel and brand-new FLO deep-rim rear wheel (haven't raced on the FLO wheel yet).

Based on what you wrote here, it seems like the most straightforward answer to your question is to train more. 12-15 hours per week, rather than 9-12, would probably do the trick. But, of course, a lot depends on how you train. There's a lot of details missing too. How did the races unfold? What were the courses and conditions? For instance, if your 11:12 was IMWI, my advice is to do IMFL. That's a good 30 minutes right there. What is your nutrition strategy and did you stick to it? What are your stand-alone times for the marathon or half marathon?

Definitely bump up the volume to a minimum of 16 hours with most of the added time devoted to cycling. Get your bike stronger and that should improve your bike and you’ll be in better shape for the run. Swim time is decent. Is that a comfortable 1:08 or are you killing yourself on the swim? What race did you do last year?

Which version of IMC did you find easier?

Sure. Swim 1:08, Bike 5:51, Run 4:03.

You are definitely capable of this and your previous experience is valuable. A 400-500 mile week on the bike at 7-6 weeks out and at least three 50+ mile weeks of running in your peak training period. Sub 11 is a great goal but you need to push beyond 15 hours per week for your biggest training weeks.

That is 11:02 right there, granted you need to add transitions.

Your bike split stands out as the weakest link.

If you are a typical AGer, smart decisions can probably take a chunk of time off.

What kind of power do you race at ?

I don't have a power meter, so I don't know what my power is. I've been going by RPE.

That is 11:02 right there, granted you need to add transitions.

Your bike split stands out as the weakest link.

If you are a typical AGer, smart decisions can probably take a chunk of time off.

What kind of power do you race at ?

I was exactly at the 10% line for both bike split and run split; they were both right at 150th/1500 racers.

What tires do you use?

Volume: If you're able to hang out at 12 hours/week or even 12-15 hours/week you should be able to get there. What's your weekly running mileage?

Age 48; Weight 158 pounds this morning; 10 years in the sport, first IM 2015; 9-12 hours per week training; 2009 Cervelo P2 with HED deep-rim front wheel and brand-new FLO deep-rim rear wheel (haven't raced on the FLO wheel yet).

I pulled it off — i just switched from penticton to Texas

From my experience these are things that helped me improve:
- Race selection. It needs to suit your strengths and needs to be a fast one. The difference between slower races like Lanzarote and the fastest like Florida or Barcelona are huge.
- Consistency. If you are consistent with training over multiple years you'll get better
- Frequency. If you train more often you will improve. Going from 2/2/2 to 3/3/3/ or 4/4/4
- Volume. With more volume you will improve. Tracking how you spend your time might help you optimise and finding more time.
- Manage intensity. Have high intensity but not too much. Too much will get you injured or sick. Consistency is the most important thing.
- Get a coach if you don't have one.
- Better equipment can get you a lot of speed on the bike
- Better pacing at the race (don't swim or bike too hard)
- Better race nutrition (a little more liquids, a lot more carbs. 90g of carbs per hour or more)

you get your best bang for buck in running... 30 miles is even low. perhaps train for an open marathon that takes place 2 months before the IM... typical bq person does about 50mpw+

I pulled it off — i just switched from penticton to Texas

I like this answer. Just run more.

I have nine children.

I wish this was an option! Penticton is a two hour drive. The race is so convenient and works out way cheaper for me than any other options (no flight, less time in hotels, no time off work etc.). Ironman is already so expensive and fairly hard to justify putting money into (I have nine children and the first two are now in university, so margins are tight). Ideally I would love to travel to races, it's just not an option right now. I even got a roll-down spot for Nice but had to turn it down for financial reasons.