From the pictures, the tea strainer is too fine [X(]. You will need a coarser one. My estimate is that you are reducing the compressor frontal area by more than 40% with that very fine tea strainer. We use "sink drain" filter instead of tea strainer. You should be able to find coarser screen in the kitchen and plumbing section. Sorry, but such restricting screen will limit your J600R's performance and may cause compressor stall.

Regards,
Kraivuth S.