The inkmoth nexus should be main deck, there is never a point where you do not want one. i see the use for victory's herald, but in the end, they should be dead by the time it matters. also you will want journey to nowhere and more soul parry's for the main deck, which will allow yourself to rush and not take massive damage. I recommend two Revoke Existence and two divine offerings for the sideboard to handle any artifact based decks. also, cut the flensermite, and add another stinger or tine shrike, flying infect is always good to have.
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I had decided against pyromancers because of the fact that the only real time i am casting another copy of a burn is when i am stacking up lethal burn at the end. i tend to hold most burns except for searing blaze and staggershock, and they wouldn't be enough to put an ascension online. i was considering fire servant, seeing as it has a very similar, if not the same, effect in mono red burn, but it was too costy
a few things. With a deck that has that much life gain, it would be a lot easier to win through means of felidar sovereign or test of endurance. if you were to go that route, you could take out some of the power creatures like baneslayers and maybe a pridemate or two, seeing as you wouldn't need high powered creatures anymore. another problem would be some choice red and black decks. Red decks have leyline of punishment, which can stop your life gain before it even starts, and has a lot of speed decks that can out speed even fast life gain. a few more fogs would be an easy fix for that. i recommend safe passage, so you can still deal damage to their creatures while you and your creatures are safe. the main problem with black decks would be cards like sorin markov, and possibly magister sphinx in esper artifact decks. since they can drop your life total to 10 from no matter where it is, you end up wasting alot of life gain spells for nothing. using something like platinum emperion once your life total gets high enough is one way to fix it, or using ruin ghost with eternity vessel is also effective. another problem you might have is with infect decks, seeing as they don't attack your life total, and successive attacks will leave most defense on the board looking a lot smaller then when they hit play. once again, another fog or two can take care of that effectively.