the mid and midplus models for the RDX500 and RDS001 are definitely gonna play different (not as much for the rdx500). for the rds001, there is quite a weight/balance difference, so they will feel and play differently. as for the midpluses, i haven't tried the rds001 MP but the rdx500 MP felt very hollow and unstable for me. i currently use the rds001 mid and i feel that it's a very good racket. it's got a larger sweetspot, swings lighter, and has more feel compared to the n6.1 tour 90.
to the OP, what part of your game do you feel is not suitable for the n6.1 tour?