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You are on the cusp of one being too long and the other too tight. I would adjust the rear wheel fully forwards and then measure what length belt you need and compare with specs...unless someone on here knows for sure and can assist.
Put a new stock belt on it and will be ok with a 30/70 set up, you will have enough room for adjustment. I took a carbide deburr bit and added clearance for several future adjustments but a stock belt will work the way it is.
When clearanced, it will go back as far as axle flange hitting the shock mount and I actually got mine too tight after 4 years on the belt with a recent adjustment, had to back it off a little. Also used a HD sidecar belt that is one tough unit and doesn't stretch
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