at 82kg i wouldn't consider you heavy at all & in need of a super stiff board.
i'm 6'2" or so & have about the same size boot, but i'm about 105kg.
i've ridden wide boards since i first started snowboarding over 10 years ago, so i've had my fair share of days on them. sure they're not quite as quick to turn/spin as a lower mass regular width board, but once you get used to them they're not that much different. i have over 100 days in on a burton floater (powder board) and several on my new ride, a 159cm True Courage Wide board - which is from the brand i rep for, True Snowboards.
i much prefer the courage over floater now because it's a true twin tip, so i can land 180's with it, as well as use it for snowkiting. (requires the ability to ride back across the wind fakey - which isn't so easily done on a directional powder board.) if you're anywhere in north america or the european union, our boards are available to you at one fair world price.
as for risers - never muched liked binding plate risers.
gas pedals - the ones with my old burton step ins helped a lot.
low form boots - i rock a pair of solomon f24's & they're about a size smaller on the outside than most other boots, allowing me to use some of my regular width boards quite easily without a stupidly wide angled stance. i also wear solomon boots because i have narrow ankles, so if you have narrow ankles as well - check them out, they're incredibly comfortable.