Hello I Am Having A Urethra Reconstruction On Sept. 8,

Hello I am having a urethra reconstruction on Sept. 8, I wear a superpube with no bag, I plug, I've had the superpube in since October 2014 and had my first attempt at reconstruction in December 2014, I've always worried latex superpube caths but recently had a silicone one put in and it's been a nightmare, this is my second attempt with a silicone one and it still sucks I don't feel I empty my bladder like the latex one does and not to mention the hardness of the silicone makes it incomfortable, my question is is this common with the silicone ones when wearing a plug this sucks cuz I need to be in tip top form for my next attempt at construction on Sept. 8, 2015... please help...