2015 C650GT Brake Flush question

A friend and I took on a brake flush the other day on my new to me '15 GT. I've done plenty of flushes on various other bikes/brands before and checked the procedure on the new scoot in the service manual. Everything seemed to be pretty standard issue and basic. The problem comes in when my friend inadvertently attached our drain line to the larger bleed valve on the left side of the bike. I pumped the right lever and he cracked open the valve nut. It flushed fine from my perspective at the lever. He didn't notice what he had done until we got around to the right side bleeder and that side looked different. We then discovered the smaller bleeder valve on the left side that looks identical to the right.

We continued to bleed and flush the system and topped off with fresh DOT 4. We thought everything was good but a subsequent ride now indicates a spongy feel at the front lever. We flushed everything well enough that there weren't any air bubbles but now I am wondering about that larger bleeder getting used. The parts fiche's don't call it out specifically and the right side just has a banjo bolt there. Picture included to clarify. It's the larger/lower capped bleeder that I am referring to.

Thoughts about how to regain my firm lever feel and whether it is related to cracking open that wrong bleeder?
 

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