I'd shoot them as is. You can reduce the difference be weighing and sorting your components so the heavier components go into the lighter shafts and vice versa. Afterwards, the difference in weight will likely be insignificant to the total weight once you add the insert, point, nock, and fletching; a 5 grain spread on a 400 grain finished arrow is a 1.25% max difference between 24 arrows.
Gold Tip sorts their dozen arrows by weight code (sticker on the front of the box will show the weight code), which may explain why in 24 arrows you're seeing a difference of ~5 grains as you may have received 2 different weight codes for each dozen.
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