I wouldn't cut your shafts until you know how they fly. You may need that extra length to get the spine correct.
I would start out with a 7595 gold tip trad at 11g per inch for a 341 g shaft. Add 100g brass insert, nock and feathers for a total weight of about 460g. If you shoot a light weight point like a 125g you would end up with an overall arrow to poundage weight of 8g. That would be acceptable, but that is the typical minimum weight to avoid warranty issues. in other words your at the border line of dry firing. Your bow will be much quieter, and smoother and just plain shoot better with a little more weight.
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BigJim