think i may have just found something, anyone used Malic Acid?
Sour (malic acid) was what I used and I worked well for me with a citrus mix I was working on.
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The problem I've had with malic acid is getting the flavour balance right - I get the tingle on the tongue - but I also get the flavour of malic acid alongside whatever flavour I've used it in - It's like the sourness of sharp or unripe apples (not that silly really considering malic acid is extracted from apples! )
I need to do a bit more juggling with flavour and sweetener % in there I think