Your OP seemed to frame the situation a little differently. It really didn’t make it clear that you are looking for… that kind of exhaustive data. I’m certainly not making any videos!
If all you want is regulation you can use a zener modded 7135 driver and 2s. You’ll stay in regulation with <200mV of headroom, that meets your goals right away. (I forget the precise dropout voltage.) EDIT: sorry, I forgot the comment that I was replying to mentioned 12v. To me the OP made it sound as if your ultimate goal would be to regulate a 6v emitter on 2s or a 9v emitter on 3s, but that no longer seems to be the case?
If you specifically want a buck circuit (for a higher Vin maybe), why don’t you compare the items from the OP in MRsDNF’s handy MT-G2 driver thread with the list of drivers reviewed by HKJ. There’s bound to be a couple of overlapping items. Actually I don’t think there are. The T6 driver HKJ tested is specifically what i had in mind, but the one comfychair used is different. FWIW I think all of those drivers are actually just different implementations of the QX9920 driver, so they should be in the same ballpark performance wise. At a glance the HX-1175b looks nearly identical in component selection to this driver which HKJ has done a comprehensive review on (the “T6 driver” I was referring to earlier). Note that HJK’s review is done with a “normal” voltage SST-90, not the higher voltage MT-G2. I don’t expect that to make a difference in the quality of the regulation.
Some of us may be more trusting than you. If I establish that I’ve got a functioning current regulated buck driver and then I establish it’s dropout voltage… I’m done! 
I might want a couple of test points, but nothing beyond a 1v granularity (8/7/6v for example).