This is worth a read, sums up current thinking on rider position and frame sizing. Draw your own conclusions...
A different position on the bike alters power output and riders need time to adapt. Always useful to spend longer periods in an 'aggressive' position for adaptation. Do a weekly longer ride on a TT bike (skis) or road bike with clip-ons for instance. And keep working on mobility!
The up-sizing refers mainly to 'uprights' or bunch bikes. On a pursuit bike, you'll want to give yourself more space for the arms, so use a shorter frame. That's if you have the luxury of using an upright as well as a lo-pro.
A Danish example of upright and lo-pro setup:
In the meantime, optimise whatever size you're riding. Compact living:
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