if im right handed and arrows go right, is that stiff or weak?

Weak

Yes I would say weak also,if you want to keep te same arrows you could try building out the side plate alittle.

fletched shafts grouping right of bare shafts are stiff.

Fletched or bare shafts?  Could be weak or way stiff causing false weak by bouncing off the riser.  Try heavier point weights to see if it goes straighter as you up the weight or keeps going farther right.

A little saying to help remember about arrow spine (for RH shooter):

'Left is heft, right is light'.  When the arrow heads to the left the arrow spine is too high, when it heads to the right the spine is too low.