Snubber, what do you think of them?

My 60 was 2.02. 13.13. I had 3.54s. It bogged a bit. 325 50 Drag radials. I should have tried slipping the clutch more. Now I have 4.10s, hoping that alone will give me .2 in the 1/4
Anyone have a gear change = 1/4 change to tell?