just go with the usual 10-20% water to fuel, just how much will depend on your setup.. not sure how others go about it. but i did a base tune at about 11.5:1 a/f. then added the water injection, (noted no diffrence in afr) lean it out to around 12:1a/f added a bit more boost.
havent had much to do with rotaries. but know enough, to know that going lean will pretty much says goodby to the apex seals. definitly lean it out more than 11.1:1 as the water will be taking over the cooling effect of the extra fuel and then some, like you said.. just how lean to go i cant answer sorry
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