11:6a Although I am not a polished speaker, I am certainly not lacking in knowledge.

I may be untrained in ⌊public⌋ speaking, but I have knowledge ⌊about Christ⌋.
-or-
Perhaps I am not an expert in ⌊public⌋ speaking, yet I ⌊certainly⌋ do know ⌊about Christ⌋.

11:6b We have made this clear to you in every way possible.

In every way we have made this plain to you in all things. (Revised Standard Version)
-or-
We (excl.) have made it clear to you (plur.) ⌊that we have that knowledge⌋ in every detail ⌊about the Christ⌋ using every ⌊teaching⌋ method.

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