Where to do my next HT if not at HASCI

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I have now done two HT:s at HASCI. I have not seen the final results yet so I don't know if I'm satisfied yet.
My conclusion this far is that the procedure is completely scar free, which is great if I want to cut my hair really short. However, the grafts per session seems to be much too low for me to achieve any kind of decent result. Around 1600 per session doesn't give a thick result at all, especially since HASCI:s grafts seem to equal a smaller amount of grafts transplanted with regular FUE.

In a while I want to go for my third procedure. The question is: where should I go now?
I want to be able to transplant about 2500+ FUE grafts on one session. And I also want it to be as scar free as possible, because I am thinking about buzzing my hair down to like 2 mm in the near future. I also have limited donor and I don't want to destroy it completely. :/
Do I even have any options except going back to HASCI for another 1500-1600 graft session again?? (regarding their donor regeneration claims I can't tell if its true or not, but no one else is even claiming regeneration at all)
I would be really glad for some help here. Thanks!