Re: DA 170 on L90 canisters?
With temps that low you might consider installing a standard apartment sized instahot for pre-heat and to bring the engine up to functional operating temps. With the minimal addition of weight from the Omega you should have plenty of room left over for the instahot.
Never lie, and never minimize or gloss. Tell it like it is and let the pieces fall where they may. The truth always wins.