Digirium

Moving the recharges around between Fiery Embrace and Hasten sounds like a good choice to me. Some farmers swear by the incarnate Alpha ability that boosts recharge so may be that's something else to think about? I have a Spines/FA AE farmer that used to have Consume and Healing Flames but no longer has either power. Like that Alpha recharge ability, some swear by the +100% recharge proc. I'd say: it's your build, decide how you'd like to make it - you've made a good start, try the options see how they make you feel and then experiment with other options until you end up with something you like.

Winter Sets two ways to get those IOs: reward merit vendor or the Winter Super Packs @ 25M. From those packs, sometimes you get two, sometimes you only get one and other times no IO. Those packs are the source of most of the 22M Winter IO's on the auction house. The other super pack that contains the ATOs is 10M and ATOs are 8M. I see cause and effect. And it ought to be no surprise Hami-Os are 60M they are hassle to obtain, some servers don't even bother raiding. I'd never make a build that uses one. AFK farming does not equate to billions of Inf - pretty much the opposite. May be I'm doing it all wrong but never seen a billion from farming (let alone billions) and that's not AFK that's actively running around the farm map, pressing buttons, getting on the auction house etc. I see a lot of activity on the auction house that is "buy low and sell high" i.e. buy a recipe for cheap, manufacture it, sell high. A smart player can work around this overhead and save themselves a lot of inf. I like Wenie's farm maps they're obviously brand new and quite hilarious.

Build seems functional i.e. fire resistance > 90% and fire defence more than enough at 52% even at 45% you hardly get hit on a +4x8. Burn could be better damage with the first five of the Armageddon set but keep the Fury of the Gladiator -20% resistance in the 6th slot. Fiery Embrace could just be two-slotted with recharge. Knockback protection isn't needed on fire farm maps. Endurance consumption looks on the heavy side, if all the toggles are running. There's no smash/lethal on the fire maps (2915 anyway) so Tough doesn't run, saving some endurance. You've got ranged pulls to keep on pulling the aggro in from walk by groups. It is possible to make a build without either Fighting or Leadership to get all the fire defence (I didn't see Steadfast Protection +3% defence). The Winter event sets provide a lot of fire defence you've already got a few of those sets including the big one in Fire Ball (+7.5% fire defence in total). Overall pretty good just questioning endurance consumption with all the toggles. And an obligatory "eye brow raised" at Consume filled with Mocking Beratement (for the 5th and 6th bonus of course), I've seen builds with two complete sets of those IOs so it could be worse! Without those it's still possible to reach 44-45% fire defence which is good enough and have between +140-150% haste in total (your build is +110% with some downtime on Hasten).

HeroDesigner v2.6.0.6 -- The view for powers and slots has changed from 3 to 6 columns compared to the previous version. The problem is that IO icons are getting very squeezed up unless the window is stretched horizontally and then the window takes up too much space horizontally. Is there a configuration option to use the 3 instead of 6 column view layout? If not, then please can we have that option?