I hate making suggestions on stuff like this as the person probably knows 10000x what I do about it.
But, I'm genuinely curious in the balance of CRR and aero between a 23mm on front versus a 19mm.
I'm not in a budget to afford the newer stuff and wonder what I throw away in CRR and practically applying power comfortably on a 19 versus what I could with a 23.
Not sure how you'd objectively do that though given your swap on the disc wheel and wheel swaps being a limiting factor.
Just a curiosity I've always had.
In terms of something easier to test? I've also wondered whether stacked hands is only a "high hands" trick or could also work out with lower hands.
Even if I think I ride with higher hands, it's not even close to what the modern fits are doing. If the road is smooth for a while I'll stack em. But wonder if it is worth it or not since I'm not "that high".