Zero Latency on an instrument track?

Im new to this. Have a bad latency problem running an Ekit through Midi. I just got a Mac running OSX Maverick, Quad core intel processor, 16 gigs of ram. I know how to set up a zero latency que mix but is there a way to enable that on an instrument track??

Any ideas on how to correct this issue?

You cannot set up VST instruments for ZERO latency, but by adjusting "Device Block Size" in your audio settings you should be able to get it down to undetectable.

Thats the strange thing. Ill adjust the block size down to 64 samples and I have practically the same latency I do at 512 samples.
I didn't have this issue with my PC. I dunno if its my Firestudio interface... Ugh I'm pulling my hair out here.

Well think I just figured it out. I recently bought Slates VTM, and VCC and had them attached to al 18 mono tracks, and trying to track drums. I guess it was bogging down my CPU. without all the plug ins running I have no latency. I can't believe the 2008 Mac Pro CPU can't handle this... UGH!