Heh, this is kind of timely. I *just* swapped my front shocks to lowered units.
I wouldn't consider my car to be 'lowered'. I do have an adjustable front beam, but it's only adjusted two or three notches down from the 'full up' position.
My car rode *VERY ROUGH* when I first got it. I replaced all four shocks and that didn't solve the issue. I rebuilt the entire front beam and even lowered the air pressure in my tires. The ride was improved, but still like riding in a covered wagon.
I finally measured the length of the "boge" shocks when the car was at rest. I measured the length from the top of the upper shock body hood to the middle of the lower shock mount/bolt. The measurement was 12.75". I removed one shock and compressed it to 12.75" to see how much travel was left in the shock before it bottomed out. The 'bottomed out' measurement for those same two points is 12.5". I effectively had .25" of travel before the shocks bottomed out.
The lowered shocks are much shorter. I have installed the new shocks this morning. The car has improved suspension travel. I haven't driven it yet, but I'm hopeful that this will improve the ride a bit. I'll keep you posted.
I don't know what shocks you have, but maybe start by measuring the current length of the shock with the car 'at rest' and then remove one shock (two nuts) and then measure how much travel is left in the shock. Maybe it's worth a shot.
If you find that you just need new shocks, I have two brand new boge shocks that have less than 2000 miles on them. I'll make you a rippin' deal on 'em.
Ted