David- welcome to the forum. I’m not a pear expert but I have one branch of Warren (mid-season bloomer) grafted into Potomac- mid-season bloomer and an excellent tasting fireblight resistant pear. I can’t find a good bloom date chart for pears on google- I bet @clarkinks knows one.
I recall reading that Warren blossoms do not appeal to bees so grafting in one or even two other mid-season bloomers is a good idea. Just be sure to check blight resistance if you’re in blight country. Dave Wilson nursery calls Warren partially self-fertile but I recall other growers having a hard time getting it pollinated.
I bend my pear scaffolds to near horizontal when young- that changes hormone flow and speeds up fruiting. In older rigid branches you can cut a “hinge” on the underside of the branch where it meets the trunk then pull the branch horizontal with soft rope or similar. See hinge discussion: How to cut a hinge?
Not pruning until after it fruits speeds up fruiting.
Some rootstocks also delay fruiting but I can’t speak to that.