Help with RY4 Double

[NSFW]

I'm looking for a good RY4 Double recipe. I made a solo one with 10% but i was a little strong.
Can i mix it other thing......I have Capella Vanilla Custard V1.

 

[MHL]

Some of our favourite recipes.

^^ Vanilla cardinal is very decent IMO.

R4D mixes will with vanillas, toffees, bakery stuff and (randomly IMO) apple.

Personally I tend to prefer it as a "hint of something tobaccoey" in other flavours, over using it as a standalone or dominant flavour.