Frustrated with inability to do body work!

As you block you don't want a lot of pressure into the panel. I shoot epoxy primer before any body working. Do the filler over it, then shoot high build over that and continue the blocking. I also do the body assembled and panels aligned. If you've ever looked down the side of a car and seen the low spots at the edges of each panel as you go down the length... It's also harder to put too much pressure into the panel on the block when you're doing it on the side of a car. That's from trying to block out the body parts individually. You can get a much better final product doing it assembled. Least IMO.