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There is a small community of us here who maintain interest in mixing services. Most bitcointalk members are reasonably happy (my characterization) with the services they actually use (ex. bitcoinfog). I am happy with
bitmixer.io (see my ad, but otherwise I am just another happy customer -- not affiliated) as well as
blockchain.info's SharedCoin service. Both charge around 0.7%, plus-or-minus.
I do not know, but would guess that bitmixer.io had to build up trust over a fairly long time to get to where they are now.
I think that you are going to need some people to try your service and report back. Maybe cut your fees for three months?
I hope people post with any experiences who try mixing.space.Good luck!