My position on this is no secret (especially since I am a general editor of a Psalter Hymnal), so I shan't link to writings of mine linked here before or re-argue points that I've argued here or elsewhere.
One thing here does rather surprise me, however, and I've not discussed it here (though I have elsewhere). Jesus Christ appears in the OT exclusively in typical form (WCF 7.5) and only "under the gospel" is Christ "held forth in more fullness, evidence, and spiritual efficacy" (WCF 7.6). Expressions of several in this discussion, if I read them rightly, have tended to downplay this and speak as if reference to our Lord in His Incarnation is as explicit in OT times as NT.
If I've read this rightly, this is a misguided approach to redemptive history and biblical theology. Is Christ in the Psalms? Of course, and we rejoice in that! Bryan Estelle, our Hebraist for the TPH, is revising an essay on that to be published on our website (in progress). But to speak as if our Lord Jesus Christ is revealed in the OT with the explicitness that belongs only to the anti-type in the NT is not correct and threatens to "level out" all of redemptive history and take away the vital development that we see therein (and in which we glory!).
Again, maybe I misread some of you, though having looked again at some responses, I see a tendency to flatten out redemptive historical development that neither the Reformed more broadly nor the Puritans more narrowly embraced.
Peace,
Alan