without RNG your rotation is the most powerful you can use. You could get more if you use IA and proc discerning eye but the odds of that happening are extremely slim and, im not sure you have the other skills unlocked to really use that rotation (utmost caution and single mind).

Long story short you need to level up and upgrade your gear. The only thing that increases collectability is your perception stat. I wouldnt worry too much about collectibles until you are level 60. There is a thread around here somewhere called rotation analysis and there is a fabulous spreadsheet that breaks down all possible rotations and perception needed if you want more details I would recommend you take some time to find it.