Emonda SL or SLR

I’ve got a 2017 Emonda SL5, I can put out VOmax efforts of about 390 watts and I weigh 90 kilos. I don’t think I can notice any lack of stiffness. I have some really strong aftermarket wheels, with 32 spokes rear and 28 front, because I was tired of having to true the wheels every few months. It might be the wheels in your case? Or maybe I am just not perceptive enough to notice the lack of stiffness.