try using some TPA malted milk, or some type of cream to give it that milkshake feel... the vanilla bean ice cream sounds about right.. i have never tried the mocha though. bavarian cream might be good also. i mix at a high percentage because i like big flavor.. but i would be cautios about that mocha.. it might be a strong flavor i have the capuccino from TPA and i honestly cant even use it. i have to try it at 1% to see if it tastes right.. (just a thought)
your mix does sound tasty though.. good luck.