Grape plant fertilizer

I have a 4 year old grape plant, Flame grape to be exact. It produces quite a lot of grapes but many do not ripen properly. A bunch will have raisins and green immature grapes. The plant and leaves seem fine, I have to trim the runners back weekly as they overrun the neighbors lattice work.

Some bunches will have small grapes that never fully ripen. The plant gets sun from around noon to 5 or 6 as there are structures that shade it, if that matters.

Healthy plant but the grapes are kind of a bummer. I put a shovel full of steer manure around the plant during the winter and water it in. Should I be doing something else for fertilizer?

Have some tomato and cucumber plants and same question for them, though they are doing fine in producing good product.

Far as I know, grapes don't like the soil very rich. And steer manure is pretty damn strong too. I am no expert though, but I'd say fertilize a bit less...

If your tomatoes and cucumbers are doing great, you're obviously doing the right thing for them mate!

i think uncle ben knows how to grow grapes, give him a shout out, something about trimming 2 leaves off each bunch and making sure the leaves barely shade the grapes... idk