TBTS Rear Suspension Problem

[mechth]

I am riding TBTS for 6 months. My back is paining I put a brand new suspension, still the problem persists. I ride 60-70 kms per day. Now am riding with low pressure(28psi) so it is some wat ok. If my back pain persists am going to sell the bike......
Pls give me a solution coz i am lover of RE and i don wish to sell that beauty beast....

 

[Releesh]

Your SMS language make the thread difficult to read. Please more elaborate. I mean your ride is on highway or city? is it a new one?what is your riding style? very slow(<50KM /hr or medium(50-70) or fast (70<) ?