The morning glories may have been a reason for less blooms on the climber. Roses need 4 things to bloom well: full sun, adequate soil moisture, fertilizer to keep vigor strong, and good foliage health. You could fertilize a little more I think. Also if any pests or diseases damage the foliage this can weaken the bush and reduce blooming.
I suggest you cut them back by about 1/4 and then fertilize them now and again in 2 and 4 weeks. I think you should see a good bloom in the fall.
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