Martin saber set-up ?
 

I just like to ask the expert on arrow choice for the New Martin:45 to 60 80 percent let-off
50lb peak
27" draw cams
whisker biscuit total arrow length 29"
arrow selection was ICS Beman carbon 400 cut to 29"
8.4 GPI total arrow weight 244 plus 100 grain= 344
arrow tip 100 grain
I just may increase the bow peak weight to 53 lbs
are they spine correct for my set-up

RE: Martin saber set-up ?
 

Yeah, the sound a little on the stiff side as is, but the next weaker spine is a 500 and that would definitely be underspined at 29", or at least right on the upper limit. The 400, being the next stiffer should be just fine.

If your in a quest for more speed there are other arrows with a 400 spine that are lighter in the mass weight department. You just have to look around for them. One I shoot is Gold Tip's Ultralite series. I shoota 500 at 27", with a 27" draw, and about 60# is as hard as I can push them with the hard cams on most of today's bows.