After yesterday's WA and WB, steering was slightly pulling towards left. Visited the Wheel balancing shop again to check it.
Yesterday he rotated the tyres(right rear to front) so this tyre was culprit with its uneven wear which is not visible directly. The tyre shop fellow mentioned this about tyres as from now on these kind of issues will come up as the tyres have become hard and will have this kind of wear and tear. Changed the right front again to rear and now issue got solved.
Hmm, with this its seems to be I should be ready to replace the tyres after my 40K service.
He sell Hankook and BS , Michelin tyres and suggested me to go with Hankook which have same rubber like BS and cheaper by around Rs.1000. I will check them during my 40K service