I got a H 7.2 for exactly that reason . So far the batteries appear to go flat faster. I can,t quite bring myself to waste 7 batteries to do an exact comparison of the run times.
I really hate the controls on the H7.2 and it also has a low batterie warning which makes it strobe while you run. Only 1 hr max power left you would think , but no it,s still running 3 hrs later and only strobes again if you try to negotiate technical part of the trail and want a good steady light.
It could have been a really good head torch. All they had to do was add that extra batterie and perhaps add a little red LED on the batterie pack to protect you from being run down from behind. But no they decided to bling it up to appeal to people who like complex things.
Alpkit gamma can have reliability problems. I know of several that have gone wrong.
LED Lensor H7 does all you need for night ultras and you can buy two for the price of a Petzl which is a good thing as you should carry two for winter events. 180 + lumens for about £28 each . They got me to the Spine finish line twice.
Don,t get the new improver H 7.2 as it is over complex and £ 10 more expensive to justify the gadgets added by the nerd teck head who designed the "multy function switch . Any torch that requires you to spend an hour reading the manual is not worth having. When your brain fails you in the middle of the night you don,t want to have to re-read the manual!
Don,t get over hung up on kit. No matter what you read on "essential Spine Kit " its only as good as your ability to use it.
Re the boots V trainers+waterproof sox thing. It comes down to comfort and grip.
My Salomon Sky boots kept my feet dry this year but for some reason the left boot bruised my foot so I abandoned them after day one.
Think of kit choice in the same way as you think of layering. Don,t put all your eggs in one basket. In many ways one of the main kit problems is the limit of 20Kg for your drop bag. You will need different kit combinations for each phase of the race.