The main problem that I see with you regen analysis is that the standing rate is 12 not 18 and hat means the bonus is 8. All the rest of the regen (regrowth/fungi) can be had without being troll/iksar, so we are really talking about FSI vs. 8hp standing regen bonus or 11hp sitting regen bonus.
8hp/tick is 72hp or roughly one extra CanniIV every 2 minutes for an increased mana regen of 4.1/tick. That translates to an extra torpor every 5 minutes, or an extra slow every 8.5 minutes. The extra torpor translates to an extra 665 - 831 mana over the same period. That translates to an additional 13.6 - 17 mana per tick. Assuming you are able to burn mana and canni enough to take advantage of that, it's pretty damn good. Better than I'd have thought ^^
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