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Right after blooming is the time for major pruning. You can take out no more than 40% of the leaves during any one pruning without causing severe stress to the plant. Start with the largest, thickest branches and cut them to the ground. Trim to control height but keep the 40% in mind. Every year thereafter, take out 1/3 of the stems to the ground.

It is likely in need of fertilization if you do not do this every year. It wouldn't hurt to go ahead and apply dolomitic lime and wettable sulfur to the area, as this will kill any possible infection as well as condition the soil back to a fertile pH.

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

New transplants are going to struggle. Even with your best effort, roots are destroyed and often these are the very small feeder roots. Plants need to focus on their root system before they resume top growth after transplanting. Give them a half-strength fertilization and keep them watered weekly until you see new growth. On very hot days, give them some shade with a sheet or a leaf bag placed over 2 sticks. The damaged roots are not able to replace moisture as fast as the leaves are losing them.

I'm in zone 4 and also had issues with my Weigela (well established) this year. I thought it was a goner, but I pruned it down by half and it began to slowly leaf out. I would suggest some extra watering and an all purpose fertilizer.
Did you check the stems? Stems that bend are still alive but if they snap off they have died.

Good luck!

Sufficient direct sunlight is essential for variegated weigela to produce bountiful blossoms. To maximize its late-spring profusion of pink, trumpet-shaped flowers, the planting site should provide full sun.
For best flowering, prune variegated weigela right after it finishes blooming each year.
Nutritional deficiencies can trouble weigelas. With nutrients lacking, flowers develop late, are undersized or fail to develop at all. Most soils don't lack the nutrients plants need. Instead, deficiencies result from conditions that limit the plant's access to nutrients that are there. Overly wet soil can be one cause. Variegated weigela thrives in moist but well-drained soil.
Late spring frosts can also nip early flower buds and prevent blooms. If your weigela sustains cold damage, remove all dead and damaged wood. This redirects the shrub's energy into healthy new growth that translates to more blooms this year and next.

Trim canes, twigs and branches by hand, one at a time. Always cut above a flower bud or a shoot where a new twig will appear. Make an angled downward cut on the twig or cane to prevent crushing the twig.
This pruning technique is also for your variegated plant.