To increase ignition timing accuracy you can upgrade to VVTi-engine crank sensor wheel, 36-2 type. Of course it works quite good with 12 teeth wheel but better results can be had.
In any case get a brand new cam sensor, and fit it to the front side. I have noticed that many aftermarket cam grinds produce lower and noisier signal when back side sensor location is used. Yes I have tried all the combinations, and yes I have tried few other management systems with similar results
. This is same with 1JZ but difference between front and back sensor locations is not so big.
Seems that Toyota oem crank and cam sensor ages faster than many other brand oem inductive sensors. Make sure that sensor wire shield goes all the way very near to sensor pins. It helps to keep noise out. Ref/Sync capture is a great tool to get sensor voltage levels and filter tables properly configured.