I like John Leadley Dagg's writings. He also has a treatise on Church Order that is printed separately from Manual of Theology, and (I think) sometimes called Manual of Theology, Part II.
I think W. T. Conner, a Southern Baptist at Southwestern Seminary in Fort Worth, wrote a systematic theology. I don't have it and don't know that for sure.
Trying to rewad various refomed theology authors, andseem that vast majority were not baptists, but Preby!