Avo Suspension Kit

Heya, does anyone else have this kit? I've recently purchased the AVO GTZ kit, and quite frankly, it's a pretty poor kit. If anyone can advise other options on lowering the MG ZR 30mm, then please post. I've had about 5 mechanics having problems fit it, and finally it's fitted. However, when driving, the suspension squeeks, and it feels like, when going over a bump in the road, the suspension temporarily comes out and pops back into place. It's the furthest away from a smooth ride that you can get. Even tho the dampers are set to hard ride, i've softened them up abit. Even so, anyone with any suggestions, please post.