In recommending that book, I was thinking more of the general reader than a scholar like yourself.
More heavyweight works on the covenants are
The Divine Covenants by A. W. Pink (Pietan Publications but available on lined here:
http://www.reformedbaptist.co.uk/The Divine Covenants by AW Pink.pdf or
Recovering a Covenantal Heritage edited by Richard Barcellos (RBAP. ISBN 9-781499-714487). The latter has contributions from James and Michael Renihan, James White, Stephen Weaver Jr. and the Puritan John Owen, and recommendations by such Baptist luminaries as Tom Nettles, Voddie Baucham, Conrad Mbewe & Nathan Finn.
Loads more stuff on the
1689 Federalism website.