I see this question asked a lot here and recently had the same question as I was switching from carbon arrows to doug fir from Surewood. I went from a GT 7595 to an 11/32 80lb spine full length shaft with a 160 gr point. The first few shots showed me that something needed to change so I built out the strike plate just a bit and things seemed to work.
This was my first three arrow group at 20 yards after building out the strike plate.
This was seven arrows shot at 5 yard intervals from 5-35 yards. The 35 yard shot was a pinch high.
And just for fun, these three were from 50 yards.
I think I am happy with the results!!!