Radrunner Plus Seat Upgrade for Short Person 5'0

[tbae]

Hi everyone - I had the Radrunner Plus for a couple weeks and it's an uncomfortable seat for sure.  I'm trying to find a comfortable seat that can still be lowered to be the lowest height while at the same time won't be prevented from sitting in the lowest position because of the front part of the rear passenger seat.

I tried looking on the internet with not much success - any ideas on which brand/model of seat to buy that I can sit on which can still be positioned at the lowest height in line with the height of the passenger back seat while not being blocked by the back passenger seat?

Thanks in advance!