I am doing a stove-top mash with two 5 gallon pots and a 5 gallon paint strainer. Is there a certain amount of grain that I should not exceed due to the bag? I haven't gone over 7#s yet, but sometimes the bag seems constrictive with ~6.5 in it. Is that something I should worry about, or should I just mash however much grain my pots can hold? Just want to eliminate as much extract as possible from my recipes. Thanks!