Well you already have a bike that is right at the UCI minimum weight limit as is, and outfitted with nothing but high end lightweight componentry. Your rig is probably lighter than all but the most high performance aero track/hour bikes. So I suppose lighter wheels is your last stop, short of going all out on a lighter weight frame.

problem is, you’ve reached the point that that ‘extra’ lightness is going to cost you. So you can either compromise and go with a bit heavier wheelset, or start saving your pennies. You’ll really just have to ask, is it really worth it, because you have a pretty decent idea already what it’s going to cost, and what kind of wheels you’ll be getting. If i had your bike, what I would be asking myself: ‘is it worth the cost to obtain this goal, and how much will it really help my performance, or am I just doing this to make the bike lighter on paper?’ And as a subsequent question: ‘could I make up the difference in weight by working on my performance and fitness?’

if it’s all about the hills, I would argue that working on your performance would likely see better returns. If it just about weight in general, well how many pennies are you really willing to spend? If it’s about speed, then more aero wheels, wether heavier than 1200 or not, is your best bet.

of course you likely already know all this. I think sub 1500 should be your goal, but I get the feeling of never quite being satisfied. Tough choice mate.