Ya man and feel free to ask questions even the thing that seem dumb like breathing pattern during the swim can make a different if you get into a competitive position. I'd probably limit the runs to 2 5km a week with how heavy you are, running isn't something that needs to be trained directly to get better in the case of triathlons as they are lost in the swim, won on the bike and endured during the run. That's why lance Armstrong kicked ass at tris aswell he'd come out like 20th in the swim but be in 1st by 20-30mins by the time the bike was done and then even though he wasn't a great runner he'd win by a minute or two cause it's damn hard to make up 20mins on a guy in the run.
Basically don't wear yourself out running, I'd go hit a local swim spot an extra time or two over going for an extra run