Has anyone tried both these racquets? I used to use the PS6.0 85. Switched to the Yonex RDX-500 because one reviewer described it as a modern, more forgiving PS6.0 85. Has worked out OK. But I miss the weight of the PS6.0 85. Rather than mess around with lead tape, I was thinking of getting a couple of second hand SRD-90s. Appreciate any comparisons you may have on the two Yonex racquets. Thinking in terms of weight, balance, feel, and stiffness. Thanks.