When uo get lower on the drops you want to scoot ur butt back more. It changes the equation of where ur saddle is, etc. I found that i like to have a long stem with a lot of rise, i ended up with a nitto technomic. You aren't so much using your bones to support your upper body you are using your muscles to balance and u have to get ur fit right to get the balance. If your neck is hurting thats a sign u need a higher stem.

But I'm not super aero. I'm also not an expert by any stretch but those two things helped me.