Thanks for pics. That is a biggie. I ordered the Q70 today, with the carrier mod, so I think I can't use two carriers together, which is ok/fine.
This item is not among the newest, but it looks like a goodie!
IMHO the tk75 is a timeless light (host) anyway, out of all the 4 cell lights it's well up there as an all time fav .....ever. Think back(was it 2013 ish) to the tk75vn killer throw which kicks a55 today . Host wise other than very subtle changes , it's pretty much the same other than now an extra reflector . You are having pretty much up to date LED's in with the xhp70's . It's also the highest output light in its class, only beaten by the larger rc40vnF that has 2 more reflectors and a lot bigger. Even then the F design looks not as floody due to deeper wells.
So I would still say a very significant light today......and well into the future.
As long as you put the modded carrier to one side, take 2 standard carrier (two run time kits with the new knurling or old type of you prefer that !) . Use the 2 standard kits together then you can have double +run time fine. The carrier mod removes the polarity protection so I am going on a presumption (one should never presume !) that it would be a lethal mix if a cell/s were fitted incorrect . Bad enough with 4 cells in the mix(1 carrier), imagine 8! Or it might just be too much current potential with high drains to the driver.....don't know
It can be quite easy to put a flat top the wrong way in poor conditions and not concentrating (I have done it a few times in my ecig mods! As I have a few similar , some take the cell the oposite way and when you have a few on rotation ....can happen(all polarity protected mods).
Enough waffle and congrats rich, it's awesome
Excited for you and look forward to your impressions .