This is quite a challenge you've taken on.
First off, if it was me I'd look at using two different jasmine absolutes - not least because the regulatory restrictions are so harsh on the regular jasmine absolute - so I'd want to boost it with a nice Jasmine sambac absolute as well. I don't see Hedione on your list, if you don't already have it I would buy some. It's hugely valuable in many, many fragrances but it's a no-brainer for jasmine: you could make half your concentrate of hedione and get good value from it. Methyl anthranilate works well with jasmine too and some floralozone would help to lighten it a bit - jasmine can be very heavy.
In terms of base notes the the two vital things are musk and civet / indole - as you have civet and indole I'd use both but of course only in tiny amounts. With the musk you really want more than one and for this application, to go with the musk ketone I would be looking at ambrettolide, exaltolide or romandolide (galaxolide would also be an option but personally I don't like it's persistence in the environment and people so prefer romandolide instead).
Your back pepper and frankincense will also contribute to the base and you might also consider adding some atlas cedarwood or one of the cedar-toned aroma chemicals (or both) and you'd almost certainly get value from a small amount of one of the synthetic ambergris too.
For top-notes I'd consider neroli as well as bergamot perhaps supported with some ethyl linalool plus ethyl linalyl acetate or linalyl acetate if you have them. You might also find Schinus molle (pink pepper) gives a nice bright effect with the black pepper and jasmine combination.
I hope that helps.