I realise this might not be the solution you're looking for, but could you get one of those stand to pee devices?
From what little I know of the surgical procedure, it sounds like your urethra has either been left a little long or positioned slightly forward.
You may be able to get a correction later. I doubt your current surgeon is prepared to admit any mistake, so it will probably need to be paid for separately. Moreover, it will involved cutting and stiching which will put sex out of the question for a while.