I lowered my bike 2 1/2 inches and with the shock set in the 3rd position I would bottom out a lot, I tightened it up to the 7th position and it helped out ALOT since then I've gotten a progressive spring for the rear and it is 100 times better
Hope this helps, try tightening it up and it should help you out
Yamaha v star 1100 classic
Upgrades: PCS concour spotlights and signals, cobra "drag" pipes, kuryakyn pro r hypercharger, river road saddle bags, Danny Gray 2 up seat, kuyrakyn iso grips, drag bars, PCS lowering kit (lowered 2 1/2"), PCS progressive rear spring, red led under lights
Upgrades to come: PCS triple x2 cams, PCS curburner exhaust, maybe flatside carbs??