Vane size and point weight don’t correlate that way but they are related.
Your vanes control the front of the arrow. The arrow is a given length and there is a “center” point on that arrow. To calculate the Front Of Center you have to find the balance point on said shaft.
By increasing your point weight you’ve moved the FOC forward thereby giving the fletching a longer fulcrum to control the front of the shaft.
The size of the broad head, bow tune, form or perhaps if the point wasn’t straight in line with the shaft would necessitate larger fletching (or just find and fix the problem). Having to low FOC may result in hard to tune or unpredictable arrow flight but what you’ve done isn’t going to be an issue in regard to the way you’ve asked the question. If anything it will increase stability with the same fletching IF you haven’t created any other problems.
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