Joe....I'm sure if your axle was bottoming out you would see evidence on the bumpstops,but is it possible your shocks are?
I had a problem a few years back with a lowered car,turns out the supension was fine,it was the shocks reaching the end of their travel before the suspension was at full compression.....
Just thought I'd throw this one in before you start splashing the cash.
I know there are
solutions for the rear,using a light monoleaf and an airbag,but don't know if this could be adapted to work on the front.