Um, RS is chisel chain.
You are currently running about the best chain you can for .325.
If you have that chain as sharp as it can be and the rakers set correctly, it is hard to beat.
I guess you could swap out drive spur, chain and bar for a 3/8 system, run RS on that, maybe nick the rakers down a bit low, file an aggressive hook in the cutters and baddabing baddaboom you have more aggressive cutting- but would the 290 pull it?
I would suggest concentrate on the filing of the cutters on the chain you have, get them as perfect as you can and let the saw do the work.
If you need more aggression- go find a nice 066.