I use the Motul 300V 5w-40 power. I wanted a thicker oil for high temperature protection. But i am pretty sure you'd be fine running the 5w-30 power racing. Seriously though, the name doesn't mean anything... They name every single different weight of oil by a different name just to differentiate them.
Ya, give it a try, it doesn't hurt. You'd probably be decently surprised. Also, really give that RS-R Ran-Up a chance, expensive yes, and if it doesn't do you any good, then don't continue using it. I love it. Try finding a bad review on that product haha, NO ONE review or user has said anything negative besides probably b*tching about it being so damn expensive. If you use it, the effects don't show right away, it kicks in after maybe one or two days of driving on it.