Hi Neil
(I have responded to your email at last

)
I would say that the issue with the multi CPL is that things are ok until it starts going wrong (if), and if it does it can get away from you real quick, you will go from a 95kt warrior to a 140kt seneca, and even in the arrow I saw groundspeeds of 170kts, this can get out of hand very quickly if you are not on top of it, then if you take a partial it will cost you the best part of £1000 to redo it.
End of the day I guess you have to weigh up the extra Multi hrs you will have, will it be that beneficial? a few more hrs twin duel? to be honest, I can't see it making a jot of difference. What you do want to do is give yourself every chance of passing 1st time.
Dean