It looks like you're getting a lot of good advice already but all I would add is that it could help you a lot to take the time to count up just how many calories and grams protein/day you're getting. I'm 6'5" and 240 and I think I shortchanged myself on my one cycle so far by only going 3800 cals/day while doing a fair amount of mild cardio. I'd also recommend at least 1.5 grams protein/lb bodyweight -if you're not keeping track you should start.
I also agree that 3 days/ week may not be enough though it depends on how long each workout is. I sure wouldn't be afraid of overtraining at his point -you're on gear!! Take advantage of it! Knock yourself out!
Personally I wouldn't give up on the cardio but I'd follow the suggestion above at 30 min/max 3X week, and not pushing it too hard.
Good luck!
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