Battery on the S25 Ultra

I've had the S25 Ultra for 4days and I feel like the battery on this is not flagship level. It's brand new.

I have been getting about 6/7 hours of SoT. Is this normal? I have battery usage pattern adapt on. Has it kicked in yet? Will the battery improve? Another thing to add is that I charge it to near 90% or 90% and then put it back to charge when it's around 20.

I have FHD on and I use the stylus from time tontime.