The STD has reduced to around 0.08 deg in azi and 0.03 in ell at around lc voltage of 0.9V (where the flip happens in sign and ell in wrapped). At all the other voltages of LC the std is 2e-3 deg ish in ell and azi both. 

The uncertainity was reduced by adding a wait time(1s) before the polarization camera is read and after lc voltage changes. From my understanding at this voltage of 0.9 ish V the lc molecules take more time to stabilize as compared to other voltages, which was giving rise to high std at just this voltage. Also, the ellipticity getting wrapped was giving rise to high std.

Now, the setup is ready to take measurement with better averaging and more averaging. I have left the setup to warm up. Will start measurement in an hour.