I have 7:1on my viper. I thought it was 8 but a loop was dropped out of it when i picked up the boat from AHPC. Im too lazy to fix it. But i have got used to it. You dont have to pull in as much sheet if you have to dump it at the top or bottom mark. Also i find that its easy to over sheet the main in light air and slightly less purchase helps to prevent this.

I definetly dont think you need 10:1. But maybe it would be the go when we all get too old to deal with the big air.