I used both pretty extensively in match play and initially switched from the RDiS 100 mp to the Vcore 95D thinking I'd made the smart move. However, after a 'honeymoon' period as you described it, I ditched the Vcores. Generally speaking, I would say that the two racquets are stiff in very different ways - different areas of the racquet. Overall, the RDiS is a stiffer frame though
(I strung both at 52/48 and also modified both with leather grip + OG and between 5 and 7 grams of lead from 10 to 2.)
The RDiS 100's are amongst the best racquets I've ever used. In the end however, they were too stiff for me.
wilson k90, babolat star 3