Speaking as the owner of Hazardous Press…
Those are all definitely things you should consider. Make sure it is very clear what rights the publisher is asking for, and what it is that they are giving you in return.
To clarify what we ask for/offer.
For the royalties, we consider "net proceeds" to be what we receive after Amazon takes their cut. No other expenses included. This is spelled out more clearly in our contract with the authors.
Regarding exclusivity. We ask for exclusivity on novels and novellas. For single-author collections, we don't ask for exclusivity on individual stories, but we ask that they not be sold/published elsewhere as a group.
Regarding renewals. The contract renews automatically, but can be cancelled by either side each year at the renewal period.
Thanks for opportunity to clarify,
Robert Helmbrecht
Hazardous Press