Group 3 Clematis not blooming much

I have a venosa violaceae and a princess diana in a pot. Both are in 2/3 Rd year from bare root plug/4 inch starter pot. They bloomed one after the other earlier in the season and then just stopped. They are in a 12" pot commensurate with the root mass which is growing nicely but not yet ready for a bigger pot. What I am doing wrong - not feeding enough? I had some leaf burn at the bottom after giving a somewhat generous dose of bloom booster long release granules. Are they not supposed to continue blooming? The bloom pics are from June when it bloomed briefly.

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