I come up with an idea that 1m-1M-1NT-? 2♣:relay to 2D, SO or GF 2♦:invitational checkback I think this can help responder better descibe his hand when he is interested in slam. What do you think of this idea?
I only violate the transfer with a very unbalanced hand, say KXXX XX Void AKQXXXX after 1C-1H-1S-2C I'll bid 3C Otherwise I don't think it is necessary, especially after you have shown Diamonds, since 1x-1y-1z shows 12-17HCP