if i not mistaken, the shop that i purchase from had told me that the last owner had done VC, engine oil and oil filter changed, and front fork serviced, only rear shock is remain stock.
i will try to look for the rear monoshock that you suggest.

how about the ECU flash, any suggestion for this ?

 

may I know, who serviced the YSS? and both serviced by same shop? I think this one is preload and rebound adjustable only

did you get the fully adjustable unit? can show pic?

nice, looks like custom mono
this one also preload + rebound? or also fully with compression?

oh.. nice to meet you bro, i also from penang, sungai jawi area. which are penang you from ?
got any XJ6 whatsapp or wechat group you in ? if got can i join in ?
what is the rear shock brand or local made that you purchase from the facebook seller ?

can i know how much CO setting you set on your meter ?
and what muffler do you using ? can show some photo how is your piping is ?
where does your muffler put ? under or do you extend to the rear foot rest area ?

give it another try without the windshield. this is so you get clean air coming to you. although ull have to tahan the air to ur chest for the test.

most ppl put big windshield coz they want the air to go OVER their helmet which creates its own problems....
- it creates a vacuum in the area between windshield and rider
- vacuum sucks air from all around it causing turbulence which in turns causes buffeting.
- add ur body to it which pushes air away even more, and pillion suffers more from the vaccum n turbulence

so first try to get clean, non turbulent air to ur helmets...theyre (mostly) designed to cut through air anyway.

if it works, then perhaps look into smaller windshields that pushes air away from ur chest but ur helmet still gets clean air.

on my z9, the air is directed to my chin bar. and on a z9, where the pillion sits higher than rider, pillions helmet is basically in clean air so i have no issue with pillion complaining about buffeting.