I run a Bowtech Destroyer 350, 73lb, 28" draw. Between it and the Assassin: Your Assassin is 333fps IBO, doesn't have the overdrive cams, and you're set at IBO DL = 30", whereas my Destroyer is 350fps, has the Overdrive cams, but I'm only 28" draw length. Comparatively, you will have longer arrows, which may mean you need stiffer arrows, but I have a faster bow with a harder cam, so for that I would need stiffer arrows: end of the day, these two will likely need similar arrows.

I cut my arrows 1/4" in front of the rest at full draw, so I'm really running minimum length arrows, which lets me go a little weaker spine than someone that was running their broadheads at the front of the riser (safer that way).

BUT, here we go.

You will want a 0.300" spine, or stiffer. All of the charts said I would need a 0.330-0.380 spine, so I bought Gold Tip XT Hunter 7595's, but I had poor arrow flight, and couldn't tune out a "weak spine" paper tear. Reduced down to 63lbs, the bow tuned perfectly, but my arrow speed really dropped off, so I decided to crank it back up and just find a stiffer spine.

I after messing with it for a few months, I jumped up to a set of Gold Tip Velocity XT 300's with a 0.300" spine, run about $55 for half a dozen fletched, fixed all of my tuning and flight issues I was having. Perfect bullet holes at 328fps. They're a little heavier than the 7595's were, but they're one of the lightest .300" spine shafts you can find, and again, pretty affordable.