Wheel Spacer Question...

I have searched and was unable to find an answer to my questions, if I missed a previous post I apologize in advance. I have installed 2006 Toyota 4runner wheels on my truck (2010 Tacoma Reg cab 4x4), which required a 1/4 wheel spacer to clear my front calipers. The spacer that I installed was a cheap aluminum old school style spacer, not the nice $200.00 hub centric spacers everyone on here runs. MY spacer obviously worked the wheels are on my truck and clear everything, however, I have a minor vibration at 60+ Mph that drives me nuts. I realize that the spacer I installed is next to impossible to install perfectly centered on my hub. Has anyone else had any experience with these style spacers? I figured I would throw the question out on here before I throw money at getting my wheels all rebalanced or buy the $200.00 spacers. I am also unsure about spacing my wheels out 1 1/2, it seems like kind of alot for me. I uploaded a pic of my truck, what do you guys think about spacing them out an 1 1/2?