There's a few fan attempts to rebalance things, one is E4X but there is also another balance mod out there some PVPers have been working on. Honestly though, this is just one of those things that is always a work in progress (balance). And whilst it would be nice to keep iterating on it we also have to measure the importance of time spent on balance vs adding new stuff. Normally people want us to add new stuff, then they can work out the balance, provided we don't totally break everything.
I can't say when there will be another patch for Rebellion, but for now if the balance is not to your liking I'd suggest to carry on using some mods. The community does some amazing stuff!
If you want to talk more about balance etc. try the Sins discord server.