Firstly, thanks for the welcome and suggestions!
I have brought a new 14 lbs SR2 and has it sanded to 1000 grit to fight through the flood. It really reacted to my local lanes very well. Unfortunately, I need to change to my 13lbs QZ1 after 4-5 games before my wrist give way.
By the way, does the 13lbs TR2 and SR2 has the Thrust/Sigma core? Or they have just the simple pan-cake core? If yes, I might consider getting a TR2 as my oil ball. In this way,most or less I have completed my arsenal.
Finally, my average has increased 20+ pins after changing to Motiv!
Happy to join the Motivnation!