Nobody, including my mentor, has suggested that the draw should be played differently with a 400x stack as opposed to a 100x stack - leads me to believe the depth of stack probably should not change the thinking.
I think because of the pre-flop action, I wouldn"t consider your decisions being those of a 400x stack.
I agree with many (who are your "mentors"?) in that I dont like your check on the flop here, you have so much chance of taking it down and apart from an ace, 3 or club on the turn.....................you are struggling to justify more money to the pot.....................also sets up the all-in bluff on the turn against V1.
I struggle to know how to justify with stats/%"s that the chips should go in. I just feel they should as I want to get heads up with a strong 2-way hand that is rarely going to get scooped against. Getting it all-in 3-ways is probably the worst outcome here, but still unlikely to be too -EV against most situations.
I have played a lot of Omaha Hi-Lo cash and tourneys with reasonable success and I have to say I play off instinct really these days. The more I play off instinct the more I tend to slam it all-in LOL.