Rega Ania Cantilever Bent?

OK, having seen the picture that seems to be within acceptable tolerances for an off center cantilever. of course whatever knocked the cantilever may have offset the coils to a greater degree but that seems unlikely

Are you sure you don't have an anti-skate problem? Or azimuth (unlikely with a Rega arm which doesn't offer azimuth adjustment). There could also be some sort of issue with the phono cable I suppose.

Do you have another cartridge you could swap in just to see if that takes care of the problem?

ps Nice photo by the way -- it's a bear to get these things head on!

thanks.  Based on the picture, the degree of off center should be more than 5 degree, (which is ~ 0.2mm arc for a 10mm radius) and should not be visible.  The cable connection looks fine, I will double check the connection on cartridge. I remember someone use multimeter to directly measure the voltage output of Left and right channel of cartridge. Maybe this is one way to check? Thanks. 

One more thought, cantilever is connected to the cartridge body through a suspension, which allows cantilever move around freely to pass the motion to coil.(MC). for some reason, the cartridge is NOT perfectly aligned, the cantilever will be pushed slightly off cartridge center by the groove. When playing stops, cantilever will stay at that position. So basically, alignment with cartridge or cantilever is SAME. The cantilever will eventually offset the imperfection in cartridge alignment because it actually move freely (by suspension). Well, if it is not problem of cantilever, then I need continue to look for the reason behind the imbalance of left and right channel. :(

One channel on tonearm wires could be reversed and out of phase or antiskate is off, just a thought

Some said if antiskate is too much, it may cause the “off center”! Cantilever . Currently, it is set as 1.75 as Rega suggested. Not sure if I should reduce it further? 

Reversed? You mean the connections on cartridge?  Thanks