what you could do is put a tap at the bottom of your 1 gallon bucket and then let the water run through your bags into the bucket and then out the bottom of the bucket into another container, this way you can work with the 1 gallon bags, but still use the whole machine full at a time.

as for quality, hand mixing does not guarantee better quality, in fact the long time the hash is in the water when hand mixing can make for slightly less tasty end product. with the bubblenow your trim is not in the water for any more time then absolutely needed. same with the hash sitting on the bag screens. the less time it's in the water the less terps will get dissolved and the more flavor will remain. on the whole the machine saves you about 2 thirds of the time and makes incredibly good product if used right.