1st of all, at your weight, solving for a sub 1000g frame makes no sense.
Your existing bike is capable.
In your shoes, i would consider a new frame that's 1. aero (you have the watts for it) and 2. clears the new conti gp5000 in 35C, which means 40mm measured on modern rims.
Such tyres will be a step up, and future proof the frame. Logically, such frame will also have a high stack, which should in turn allow you to be at FTP in a clean aero tuck, as opposed to being uncomfortable in that position.
Otherwise you're mostly just getting an aero frame for the looks (it's your money, if it makes you happy, go for it).
Bikes with high stack: Pinarello X, Reppit from that dude on YT, the light carbon 18D (to a lesser extent).
If you want to play with aero positions, you can buy a cockpit w positive stack and a long stem, see how that affects power efficiency and speed. Could let you tinker and optimise before you buy a whole new rig.