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I like to use Bayer Tree and shrub granules. It has some fertilizer in it and also a systemic that moves up throughout the rosebush through the root system. Apply per label directions for Ornamental shrubs. They also have a Rose and Flower granules but I like the tree and shrub better. As far as sprays go, you could use the Bayer Complete Insecticide spray.

If you correctly identify it with Witches Broom, it should be removed.
These articles have more information.

https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-rosette-disease.htm
https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/knockout-rose-diseases.htm

This article will help you pinpoint the issue.

https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/knockout-rose-leaves-yellowing.htm

Transplanting almost always produces shock in a plant, especially when it is warm and sunny. Create shade for the plants any way you can. A large box open at both ends or a shovel placed between the sun and the plant and covered by a paper leaf bag are strategies I've used. Roses love sun but not when the roots are trying to get going in a new site. Keep the soil moist, not wet. Mulch the ground to keep it cooler than sun-heated soil. The very small feeder roots are often the furthest roots from the plant center. When a rose is dug out, these are often cut which leaves the plant vulnerable to wilting. If shade doesn't lessen the wilting, then I might prune one major cane. While you are pruning, remove all dead, diseased and damaged canes. It is ideal, but not always possible, to transplant in spring and fall during cooler weather. Don't fertilize your roses until they have recovered and start to produce new growth. Water and shade are its biggest needs right now.

All roses take a little breather now and then especially in the hotter weather. When the weather cools, the blooms will return in abundance. Keep them watered well and fed. You can give them some water with a product called super thrive and some root stimulator in it the next 4 to 5 times they need water. This will give them a bit of a boost and the super thrive helps them deal with any stresses they may be dealing with. All roses love Kelp Meal as well. So if you have not done so, sprinkle a cup of kelp meal at the base of each rosebush, work in lightly and water in well. This will help the new growth to come in that leads to new buds and blooms.

There are a few things that can cause the rosebushes not to bloom as they should. Knock Out roses are no different than other roses in that respect. Please take a look at the article I wrote on the subject at this link: https://www.gardeningknowhow.com/ornamental/flowers/roses/no-blooms-on-roses.htm