I will bet you anything you'll be between a 400/350 spine. Some of that will depend on your desired arrow length(if you're a gap shooter or not) and how well your release is. With my horrible pathetic release, I am usually on the stiff side. With a bow that weight, I have shot everything from a 300 spine to a cut down .340 spine.
I have found spine to be very dependent on the consistency of the individual. I used to be much better than I am now.
Another factor to factor is is how skinny those axis arrows are. I have found that an arrow that is almost completely centershot can be much more forgiving than others. I would bet you can make either a 350 or 400 work and play with brace height, strike plate material(Will uses velcro) and silencer placement.
Good luck and let me know if you need any help. I've got a few of his bows and you wont have any complaints.
ps: I know the guy who makes his strings pretty well if you ever need anything.