Most guys I know that work out a lot with strength training, do kind of lack in the cardio department, but then, they're looking at bulking up. Good for you for forcing yourself to do it.
I have one friend who bulked up, then cut back on the calories (cut out 500-700) a day and increased his cardio to what you are doing. He slimmed way down, and worked on greater muscle definition. He was *very* well cut and proportionate afterwards.
It looks like you're doing every right to reach your fitness goals!
I have tried some intensity training with cardio, but it was mostly walk for 5 minutes, run for 1, walk for 4 minutes run for 2, walk 3, run3, etc.
It helped me go from doing a 3 mile hour to a 5 mile hour (which is no where near your fitness level).