Your arrows are fine
Those arrows are 9.5 gpi. They are not light arrows by any carbon arrow standard. The chart below will tell you that you can shoot .400 spine arrows (if your arrows are not over 31").........this chart relates to determining proper arrow spine rather than arrow weight. Minimum weight for most bow manufactureers is 5 grs per #..............= 300 grs total arrow weight for your bow @ 60#. Finished weight of your arrows will probably come in close to 400 grs (with 100 grs points). 340's are on the stiff side of the spine equation.....so shooting heavier tips may get better results (125 grs). Are your arrows too light? No.
Sizes: 340, 9.5 gpi; 400, 8.6 gpi., 500, 7.3 gpi.
Bow Weight27"28"29"30"31"32"45-50---40040040050-55--40040040040055-60-40040040040034060-6540040040040034034065-7040040040034034034070-76400400340340340-76-82400340340340--
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