You are using coilovers. Changing ride height does not affect spring travel ...unless you are adjusting height by changing preload, which is very very very bad.
Springs dont make the car bounce, damper setting do. These entry level coilovers have radical changes in damping from 1 click to another one, so you need to change them 1 click by 1 click. Try it on full soft then on full hard, you will see what i mean
also, make sure you dont preload the anti roll bars when adjusting height. Otherwise it will handle even shittier... you need to disconnect the droplinks before adjusting height, and then connect the droplinks so they dont apply a preload. Use shims if needed.