I agree Roundup helps alot. My 3 point disc also is pretty sorry. Even after adding several hundred pounds, it still works poorly and takes muliple passes, and forget it if it is dry. The disc is Leinbachs biggest, so its not a cheap disc. It definitely helps to use a moldboard plow first. I use a 3 bottom Ford 101 with my 70 horse. It really speeds things up as it really tears up the sod leaving it soft for the disc to follow. But it can leave the field uneven, so after discing, you may need to use some sort of drag harrow (I made one) to smooth things out.
I recently restored a heavy Athens 166 disc, not a 3 point. Now it is a beast, and no plowing is necessary. But it is all my tractor can handle.
Get a nice plow, a two bottom, but make sure it has trip protection. It will take the frustration out of disking.