The art to low temp dabs? Help needed!

I am sick of hot dabs and constantly ruining bangers. I got a quartz terp slurper and a bunch of iso and q tips. I have been able to take about 20 dabs without staining or affecting the quality of the banger however I am wasting a lot of concentrate.. I would like to take a fat dab like fat.. What would you guys suggest I do to achieve this without chazzing the piece. I usually have been doing 8 seconds on one side 8 seconds on the other and 8 seconds from under and wait 15 seconds. I am getting tasty low temp dabs but the entire slurper is covered in access oil. It is easy to clean but time consuming. I am afraid to go to hot or not wait long enough and just ruin the piece in a single hit.. I have been taking unsatisfying dabs and cleaning after every hit just to avoid ruining it. I am spending more time cleaning the thing than actually taking dabs and when I do they are weak because I am afraid of staining it with burnt oil..