If you get snot, then your dosing level is too high. Its generally harmless, but a sign that you are not a huge distance from overdoseing, which can cause tank crashes from a huge bacteria bloom. The bacteria is not harmful, but in large quantities can rob the water column of oxygen, causing mass dieoff. I would personally just start VERY small, and observe your tank carefully while ramping up. If you get any obvious visible accumulation of bacteria (ie snot), its time to back off....
As for mechanical filtration. There are not many options here. I recently chose to go with the rollermat. its pricey, but its automated and removes material before it has a chance to break down into P04/NO3 in the tank (which is the primary concern with running mechanical filtration). A guy in the DIY forum has built a sand filter (much like a pool sand filter) that accomplishes a similar thing to a sock, but requires manual backflushing and cleaning of the sand, but does avoid the need to wash socks. you can also size the sand filter appropriately to get 3 days or so before it starts backing up, so that is another option you may consider, assuming you have to room for one. Other than that, I would suggest going with larger socks. If your socks are backing up in one day, they are far too small for your system. They should go at least 3-4 days before backing up, but note that when first adding a sock, they will plug up quickly, but after a few changes should settle down significantly as the particulate is removed from the entire water column.