Through further thought on the topic and speaking to others in the field, I’ve decided that weighting the votes simply by cUNI held at the time of the proposal is not ideal. This would allow for any large proposer to easily buy the cUNI vote by entering a leveraged position on for a few blocks.
The solution I am proposing is checking cUNI balance about a week prior to the vote and at the time of the vote. The user votes gets weighted with the min of the two. Another idea I have for weighting is setting it to 0 if the address is borrowing any UNI. This way we have slightly more control in avoiding purchasing the vote by large UNI holders. Any more input on the method for weighting votes would be greatly appreciated.