what bulbs are u using most are only 36 degree angle and leave dark patches buy the enlite ones 60 degrees they leave no gaps even on low ceilings I have 8 in my kitchen and its brigjhter than the 4 x100 watt spot bulbs don't be buying the crap lap ones from screwfix there garbage
Initially I used the LAP ones.
They lasted 2 years max. I have replaced most of them now with 40 degree ones from TLC.
60 degree would be a big improvement
Yes our ceilings are low it's an old farmhouse.