Try a bubble level and adjust speakers correct from side to side by adjusting spikes in bases
Then get a laser level place it on top of each speaker
aimed to behind your listening chair.
Mark with tape where the lasers land for both speakers and get them both exact.
then do the tilt back to your preference.
This will help you figure out where the magic is.
Make sure you snug up all bolts after you are done.
I would make sure you have an area rug between you and the speakers and try book cases first before you pad down all the walls this will better preserve coherence, overtones and harmonics.
Make sure if you are bi wired your speaker wire is the same
type and gauge on woofers and tweeters separated at least 4 inches apart on both speakers and if you can keep it off the floor.
Cheers Johnnyr