i use bg66um on arcsaber z slash on yonex plastic shuttle at 24 lbs.

Is there are other alternative string to do similar and having more shuttle contact on string?

I need both control on all around and repulsion power, and the string maybe not too thick, like 0.68mm or below, and not too thin, at least 0.65mm

Medium feeling suited best for plastic, and bg66um is one of them.

Other alternative are like bg80p or ashaway string, does it need lower tension by 1 lbs?

badminton style are quick/fast stroke attacking play for both single/double