Arrow spine, setup question

[RecurveRookie]

Hey Gang,  
  I am shooting a 59# @ 27.5" recurve with St. Axis 400 arrows, 29" shaft, 75 gr insert, 100 gr point.  They fly nice!

 I am getting a R/D longbow (Maddog Mountaineer)...62# @ 27.5".  I want to use 170 gr points on the same arrows to make 8 gpp.  

  Does that sound like a good setup, or will my spine be too weak?  

   None of the charts go very high on point weight.  Anybody have a similar setup>

[macbow]

I'd guess the deciding factor may be if the longbow is less center cut than the,recurve.  If 1/8 inch or more difference you might be,able to make it work.