I agree that transport is very important , but in such case, you will not observe constantly 100% PRB usage ( or close to 100%).
have you observed in L3 RB Reconfig. a message used for enodeB to configure Scells? Have you observed that Scells are activated? If yes, what throughput distribution you observed? Maybe there is something in setings of CA. If you can share xml configuration of that enodeB maybe I could check.
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