if you could take HAIR and BEARD from last preview and put them to V4, i think it would be THE BEST! V4 looks more realistic for me... (mouth looks better than in your last prev) you just need to make V4 head lil bit bigger. dont worry, youre good patcher, but its really hard to make right Melo's cf... so, my advice: take V4 as a base make headshape bit bigger take moustache and beard from last prev and put them on V4
and i think thats all. wish you luck and show us some prevs as soon as possible haha