All MetalShaping - Hi I use to much filler and need help

Hello my name is Branden from West Texas. I do restoration fab work for a hobby. Learned minimal metal working skills from old timers and making mistakes. Finally bought a book called metal bumping followed guys like Tinman on IG and wanted to put a bit more thought into what I was doing. Mig & Tig just fine but struggle on larger flat surfaces or compound curves. Have been reworking the roof of a 79 Ford Crewcab for a while now on my latest project. Have a hand held planishing hammer from Desert customs hybrids that along with my shrinking disk are advancing my skills. Super green still.