I am much further south the you and was able to get 82 on a 30" dish. When using an elliptical dish, be sure that the LNB is looking in the center, or else the highest gain will not be achieved. I have a 4 foot dish for 82 now and get all transponders no problem; all are above 70%. It is hard to get without having a TV outside connected to a Bell receiver because there is really no gap between the signal from 77, Dish Mexico and some Dish Network programming, and Bell 82.
I would be much more worried about 91. If you can get 91, then you can get 82.