check the tone charts at the
seymour duncan site. the JB has more highs than bass and middle. this usually sounds good in
mahogany body /fixed bridge guitars, but it *may* not give the best sound in your rg350.
lower end ibanezes usually don't have the greatest tone woods.
dimarzios like the tone zone for example *usually* will sound better in your guitar because it has a massive eq curve at the bottom end and the middle where the natural wood of your guitar will 'need some help'. also the fact that it has a huge hole for the tremolo, it will need a pickup with a big bottom to compensate for that. try the pickup picker at the dimarzio site.
...just somethig to consider...
of course this is all personal opinion, and good luck in your quest for better tone!