With a clean nozzle and a teflon piece not deformed you should be able to print at around 200-210C for the same speed. That will improve surface quality and reduce stringing a lot.
What happen if you print at 200C?
You might want to give a good clean to the nozzle using a few atomic pull or using a torch to burn the pla inside.
You are printing PLA at 230C!?
I would say that is waay too hot, and might be (at least one of) the reason(s) your surface looks the way it does...
I would try somewhere around 180-190C, that might help you get rid of some of that massive stringing between the towers as well...
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