Yeah second Richc’s comments. No way would I use Super Tacky’s on anything other than a dedicated DH/Freeride bike, i.e. one I was going to push to the top or get a lift with (I have used them on my trail bike by the way). They drag way too much and frankly the grip from Maxxis 60 durometer is more than enough for the sort of riding you’ll be doing.
Like you I’m in the Clydesdale class, not quite as firmly (16.5 stone last time I checked), but in it nevertheless. Ironically, because I’m heavy I want my bike to be as light as possible and still be sturdy enough. Rotating weight counts for a lot more than static weight and heavy tyres will make a massive difference to how easy the bike feels to pedal, especially up hill.
I’m running 2.35 Maxxis Minnions (I using the front version on both the front and back), folding, single ply, 60 durometer, in tubeless format with Stans rim strips. I ride as hard and fast as I can (I’ve raced a lot of DH) and find these tyres to be brilliant all rounders especially in the woods. I’ve also used High Rollers in the same format and in ST compound for the trail bike. I actually prefer the lower level of grip the 60ds give as the bike drifts more readily and more predictably.