Free: Contests & Raffles.
Ling, I would probably be shooting 340s with your setup. Whenever you're on the line between XXX and XXX spine, its always better to opt for the heavier. Heavier, stiffer arrows result in more KE and well, they're just plain tougher when blasting into a rib (or two). Just my thoughts.
You agree with the above than say stick with the 400's