I was using a Yonex 880/Lux BB Original hybrid at 54/52 and was doing well with it. But, recently, out of curiosity, I tried a full string-job of SPPP 18 at 48/46 and am so happy with the results that I want to stick with it, for the time being, at least. However, this coach says my shots have lost their sting. He caught me by surprise when he said that to me today, because, with this set-up, I was feeling more secure about hitting out. So, I've been thinking about it all day and, maybe, he's right. I mean, I'm no James Blake; I need the strings to help me a bit in the power department. Plus, it's true I had to be more carefull with my top-spin groundstrokes with the previous set-up, but I was controlling it pretty well. Having said that, it would be hard to leave the new found feeling of security that the full poly job has given me. What should I do?