Honest answer is I would leave out the maples and maize from the particles, and I'd be using ground tiggers and peanuts in rather than whole. The fish will really get stuck in on smaller pieces, whereas with tigers, peanuts and maize, larger particles, they can be selective. I have seen carp picking out specific food items in a mix!
The only reason I would use salt is if I was PVA bagging it, but with dry groundbait, if you are quick enough you can get away without it.
Liquid wise, molasses and evaporated milk would be the only ones I would add, the milk is fine at creating a cloud.
I think we try to be too clever at creating our own mixes, pigeon conditioner and hemp work on their own as they stand, as does hemp and maize. Even maples work on their own, and are a good tench bait. The other thing is adding to the cost with extra ingredients, pigeon conditioner, and maize are cheap.
I do like using peanut granules and crushed or tiger granules in groundbait, but I don't honestly think it makes much difference.
The advantage of having whole tigers, maize, maples and peanuts is you could use them as hookbait.
Always a few crushed and whole boilies in the mix.
I mention I have seen carp pick up specific items from a particle mix; hemp from a mix of hemp and tares, and hemp from a mix of pigeon conditioner and hemp.
Whole tigers from a particle mix.