Can you maintain your current position for the entirety of your planned race distances?

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Bingo!

I honestly don't no yet. First year I'm going to try longer races. My fitter seams to think not. I'm not sure he's right

It's just a balance...of course more aggressive is better aerodynamically but if you can't stay there for 120-150 minutes (70.3) it's worthless...personally I've got a lot of good advice in this category from ST, but most of the insight has been gained simply by trying it out on the road and learning what I can handle as I would recommend for you. Also the comfort issues are amplified when going longer...you can get off the bike in an Oly and fight through 10k uncomfortably but try that with 13.1 miles to run and could very well be a different story. Trial and error.

Ty. Always chasing perfection. Some time's it's not possible

I primarily do OLY distance in a pretty aggressive position on my P4 but did two IMs and two HIMs over past 18 months. I had the same concerns and experimented with spacer movement. Found that adjusting two spacers (about half inch) below the stem was definitely more comfortable and I really don't think lost any performance. As others, you'll just need to experiment.

I'm building a np3. I may add a touch more height under my arm pads than I intended

I wouldn't change position until after doing several 60 mile rides.

Ok. Just thought since it's being put together now would be good time

You can raise the aero bar yourself in about three minutes.