I have experience with tanaka echo and stihl top handles. Stihl 192 or 200 t is the only way to go in my opinion. I have also dealt with stihl 020 and 009. The 192 and 200 is hands down the way to go.
It is very important for you to post your results once the problem is solved so that people will be able to reference a solution to their problem down the road. YEARS may go by and someone has the same problem PLEASE POST YOUR "IT WAS FIXED WITH x SOLUTION.