Thanks for all the input guys. I think the tiller is just a matter of adjustment. My garden has been tilled for years, and I even disc it with a full size tractor each fall so it can soak up all the rain over the winter. The soil is definitely not the problem.
As for the hydro, I'll look at the shims. The hydro really intimidates me. Lots of linkages, arms, sliding things, cams, slots, valves, levers, ..........need I go on. On top of all that the adjustments I have done didn't work. So.............we'll see.