if you can get something in the end of the hose that has a smaller orifice, you will get smaller bubbles and they will dissolve better. you can take a piece of 3/8 copper and crimp the end flat, so that just a little squirts out- even melt the end of the tub shut and put a bunch of pinholes in it with a hot needle. The high grav beers i have had best success with have had a very big starter, a lot of 02 (i usually aerate for the first three days) and sugar additions over the first week or two of primary. i also usually pitch with a clean yeast (like so4) and then throw in an 099 starter after a few days. doing the addition thing makes it hard to know your exact ABV, but you can get a rough idea where your gravity would be, had you started with everything that eventually goes in, and where you end up.