Crank Rebuild Questions

[risk74]

I will be building two 2011 Gas Gas EC300 engines for the 2019 hare scrambles racing season and have a few crank questions:

1. Who are we using for crank rebuilds in the US now? RB won't do it, Cooksey hasn't been taking in cranks for months now. What are some good options?

2. I've read up on balancing the crankshafts, but opinions seem to vary from "it's a great idea" to "the factory got it pretty good the first time, don't waste your money". Anyone have any real world experience with balancing the GG crankshaft?

3. After stripping these engines, they have the sealed crank bearings that most seem not to like. What bearings are recommended for longevity and what is a good source?

Thanks in advance.

Kris