Apparently, doing cardio 6 days a week is NOT working for you. I do not know why you ask for advice, then seem to ignore the advice given. You determination to do cardio 6 days a week is not working for you - CHANGE YOUR MINDSET.
I really really really think you need to change what you are doing dramatically. Doing cardio 6 days a week is NOT always the answer. If you are not seeing results with what you are doing - why are you insistent on continuing it?
CHanging what you do for weights is essential - but that is not the only aspect that needs changing. Too much cardio can be a detriment also - it can help tear down all that muscle you work hard to get.
I really think you need to think about just doing HIIT for 4-8 weeks and see what happens.