Ive been playing for about 4 months seriously. I used to hit a pancake serve with an eastern grip. I got pretty consistent with it. Being able to hit in the 90s and get probably half in. I started playing with better players that told me I needed to hit with a continental grip and "pronate". I started doing this about 2 months ago and Im confused. I struggle to hit flat serves. Most have side spin and kick out wide. Almost like a slice. I have figured out that my racquet fails to get flat when I am serving. It hits the ball like you would want to hit a slice serve. I dont know how to correct this, Im practicing alot and Im not improving. I have lost alot of power on my first serve and its hurting me alot in matches. Any advice? Part of me wants to go back to pancaking serves again but Ive put so much time into this pronation BS that I want to get it right.