Today I threw on some 12 guage DR strings on my new Ibanez SR420 and spent a good bit of time trying to get the bridge and intonation just right. I got around to getting the intonation on the low C (or low E string, I play C standard tuning) right, but the adjustment has caused a bit of fret buzz, and somehow on ALL of the strings. Also, the action is just a little too high for my liking on the higher frets (starting from the 10th fret all the way to the 24th). So, does this mean that I need to make truss rod adjustments? And if so, do I need to make it a little more straight? Or or bent?

FYI the guitar has an Ibanez ZR bridge. Any help would be greatly appreciated!