I am not an expert having only rowed them for about 10 minutes a few weeks. I would get a hold of the pro-loks owner and I'm sure he can get you all the info on weight as well as balance point with the new shafts/blades.

My first impression was how amazing they felt. I have felt other composite shafts in the past and thought they felt like a tip heavy fishing rod. The boat I rowed had the edge shafts with Sawyer blades and it felt really nice, I am sure the new pro-lok blades would make it balance even better. Let us know what you find out if you do talk to them?
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