Usually you subtract about 10 mm from the head diam for the reflector ID, could be higher to bout 12 mm or so. Some lights do it to maximize the reflector ID, some are notoriously bad about it, if you've seen those reflectors with the wide rim. The top end view pic in the OP looks average, not great -- I'd guess about 11-12 mm subtracted form the head diam. Usually you can go thinner with an SS bezel, then of course you got room to go wider with the reflector. Bugs the heck out of me when a so called thrower doesn't maximize the reflector ID.
That's sort of bad news - head diam is 69.5 mm, T30 is 70.0 mm, so if the reflector ID is 5 mm smaller than the T30, than you lose an extra 4.5 mm. The T30 though does appear to have a narrower SS bezel, shown here: http://www.acebeam.com/t30
True - another alternate of similar size is the Amutorch JM70 w/XPL HI. I got 2 of these - slightly bigger head diam at 72 mm. The JM70 can really throw... One I got is fully modded up, does 327 kcd w/stock XPL HI LED but DEL FET+1 driver running NarsilM. The JM70's though require some modding, but can be bought on discount.
This FT03 should do as good or close with a XPL HI upgrade. Just nice to have FET based Attiny85 driver out of the box, hoping modding is easy.
My JM70 does 420kCd with a 2mm² WF and a TA FET driver… but I don’t buy the FT03 for the same use, it’s more an all around thrower and the integrated charging is a big plus !