Terry,
Have you had a session with a pelvic health physiotherapist, to check you are doing the pelvic floor exercises correctly? You should be able to request this through your urologist, or maybe even clinical nurse specialist.
If you've been doing pelvic floor exercises correctly for a year, then you probably need some urological investigation to find out how to improve it much more, but if you aren't doing pelvic floor exercises correctly, then you need to get that fixed.