Wow.
Don't take this the wrong way, but when I swam in college we would do 30x100 on 1:30 - I would typically hold between 65 and 68 depending on the surrounding training.
If you can hold 1:01 for a significant number on the 1:30 or any of the combos you mentioned - I'm flabbergasted you couldn't make the lead group last weekend. There were 1:45 to 1:48 200 freestyle swimmers on my team that couldn't hold 1:01 on that set.
I know that adds no value, and I mean no criticism - just my observation.
What you describe sounds very much like how we trained the mid-d swimmers in my college program.
Digressing -
It seriously makes me wonder about my overall training structure - as right now I'm able to do about 1:13/14s for 15x100 @ 1:35 SCM - which would be a 1:07 for SCY. I'd have to screw up some serious motivation to turn in 1:10 SCM (or faster) several times in a row - and I would bet money on me being able to swim a 52. SCY 100 something from a dive right now. Yet - I was able to swim a 52 last weekend at IMTX and it felt like a walk in the park. ETA: even some of the swim sets that jonnyo has posted that are staples - seem really intimidating/impossible to me now - and possibly even back when I was in college - and in much better swim shape.
/head scratch
Don't take this the wrong way, but when I swam in college we would do 30x100 on 1:30 - I would typically hold between 65 and 68 depending on the surrounding training.
If you can hold 1:01 for a significant number on the 1:30 or any of the combos you mentioned - I'm flabbergasted you couldn't make the lead group last weekend. There were 1:45 to 1:48 200 freestyle swimmers on my team that couldn't hold 1:01 on that set.
I know that adds no value, and I mean no criticism - just my observation.
What you describe sounds very much like how we trained the mid-d swimmers in my college program.
Digressing -
It seriously makes me wonder about my overall training structure - as right now I'm able to do about 1:13/14s for 15x100 @ 1:35 SCM - which would be a 1:07 for SCY. I'd have to screw up some serious motivation to turn in 1:10 SCM (or faster) several times in a row - and I would bet money on me being able to swim a 52. SCY 100 something from a dive right now. Yet - I was able to swim a 52 last weekend at IMTX and it felt like a walk in the park. ETA: even some of the swim sets that jonnyo has posted that are staples - seem really intimidating/impossible to me now - and possibly even back when I was in college - and in much better swim shape.
/head scratch