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This can often be attributed to poorly draining soils and unbalanced pH. You can correct this by applying a top dress of dolomitic lime, and worm castings, as well as live worms if possible.

This article will give you more information on the care of these: https://www.gardeningknowhow.com/ornamental/shrubs/weigela/growing-weigela.htm

Weigela is not a good hedge shrub. An uneven appearance is quite natural. You know that trimming now is removing blooms. The choice is yours

Plant ASAP in soil that you have enriched with compost and/or sphagnum peat moss. Water well. Roots continue to settle in until the ground freezes so you have time. Don't let the soil dry out all the way through to the ground freezing. Roots that are low in moisture are subject to winter kill. When it goes dormant (I'm assuming you did not get a bare root plant) and leaves fall, cover the base and immediate surrounding area with several inches of wood mulch, straw or shredded/chopped leaves. This is only necessary the first year. It helps to prevent freeze and thaw cycles that can heave a new planting. Enjoy your new weigela.
https://www.gardeningknowhow.com/.../weigela/growing-weigela.htm

These two statements compliment each other. The first statement, in broad terms, states that pruning after the blooms fall off will keep you from cutting new blooming shoots off, because the next blooming shoots will not have formed yet, and the second statement reiterates that.

Weigela are cold hardy in Ohio. No special prep is needed. All plants need water when autumn or early winter weather leave the soil dry. If roots dry out, the shrub is much more susceptible to winter kill.

Here is a good, general rule. Prune spring-flowering shrubs like weigela right after they bloom. Summer bloomers can be pruned while dormant or in very early spring. Many spring bloomers flower on buds and wood that formed last summer and fall so pruning in early spring removes blossoms. Of course, if you are willing to have a year with lower blossom count, weigela can be spring-pruned. This makes sense, to me, because it is much easier to see which branches need to be removed before there are leaves on the shrub. For this reason, I sometimes remove an old branch down to the ground or thin a crowded area in late winter. I wait until after bloom to reduce the overall size of the shrub. This compromise works well for my weigela.