Talking about those feed lips? Are you sure it's fan speed and not bed adhesion? Those look like sheer layer shifts, like it started wiggling off the plate and the printer deposited the layers incorrectly. It can happen with these tall guys, especially when you print 2 and the head has to travel between them and potentially impart higher-energy travel forces into the part.
Either way, material settings should let you set minimum layer times. It'll slow the extrusions down. May also wanna make good use of your gcode viewer by switching between layer time and fan rate views.