I would def go with a 12v mod on retail slims...I've only sold rgh slims myself so I can adjust that setting in fsd or in the nand itself...
Slims in my opinion are turning out like the xenon boards...Trinity models anyway..
I have an achi ir-6000, and locally I have repaired 23 slims this year and have bought 9 red dot slims myself.
3 of them I couldn't get back going as they probably needed a reball and i just don't have the stencil to reball that chip..
Trinity models suck period, rgh your units and dump them while you can...Grab a corona and pray they turn out to be better models. Or for a safe bet, grab a Jasper and never worry again