08 4/6 drop need advice

ok i have a 08 chevy 4 door with a 4/6 drop that i installed myself .first ridr i have ever lowered but im confadent that i installed it corrctly but things are going on that i didnt expect .the rear is bottoming out often to much to even enjoy my truck .whats up wiyh that i didnt expect that and the front end seems to be more prone to walking when i go fast and the road is bumpy?are these thing normal i dnt now lowering is new to me i love the look and dnt want to change it but i have to be able to drive it without thinking im tearing something up.so help me out guys thanks eric