I'm going to be tenting in single digit temps Friday night and would like to boil water with my MSR pocket rocket stove; the only stove I have. It's not critical to have hot food but would surely be nice. I realize this stove is not ideal in cold temps even though the canister says "all season fuel blend". I tried it out last night at home with 10F temp and, after 10 minutes, the water hadn't boiled though was pretty hot. I plan to put the canister under my jacket to warm it and I'm fashioning a heat shield out of flashing. Not sure of the best "design" for a tallish heat shield. Any helpful tips about what I can do to maximize heat output from this stove?