If the cramping is only, and repeatedly, in the one calf, it makes me wonder if you have an issue with your technique or with your cleat position, or with your fit.
You may be doing more ankling on that side. Perhaps figuring out why will lead to a solution.
If you don’t care about why it’s happening, and just want to do something, shotgun style, try moving that left cleat back 1-2mm and lowering your saddle 2-4mm. Perhaps then you’ll trade calf cramps for knee pain in the opposite leg, or perhaps you’ll be golden.
These aren’t easy things to diagnose over the internet with the amount of information given in a forum post!
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