i think there was a thread from ages ago that barcrest MPU4 clubbers seem to have a few issues in MFME where they will block certain features near the top and always block - on Celebration club for example, you could just not get beyond Hi Lo Note Climb. Wonder if this is the same applies to the cashpot also. I've never ploughed enough money through one to find out!
The top bank of dips is definitely 88%, but remember you can't force these barcrest MPU4 clubbers at all. The RTP seems shared around the whole board (as in collecting stuff) , not just gambling as high as you can and losing. I also think it was mentioned somewhere as well that you shouldn't just play £1 coins with these, hence i added 10p/20/50p inputs too. Thing is i've barely put £100 through this and am miles away from a pot/cash pot LOL