Any guesses on WHY this type of cooling issue occurs??

Hey all! So I feel like this is a question I should know the answer to, but I'm gonna be honest I'm still a little stumped and hoping someone here might be able to ELI5. Often times when printing multiple parts, especially if one part fans upward and outward from the build plate, I'll end up with a scenario similar to the attached picture - the part fanning up and out will have curling up edges, droopage, poor surface quality, etc. and just becomes an overall mess. This specific picture is with PLA, fwiw but I'm pretty sure it's happened on me with other filaments too. While I am pretty certain that it's a cooling issue at its core, what is stumping me a little is the WHY. Specifically: 1). Is there any possibility this could be related to too much cooling? Or is it pretty certainly too little? I ask this because it doesn't seem to matter whether my 4028 fan is at ~80% or ~25% (and presumably everywhere in between) the same basic issue tends to occur. and 2). The only two ways I've found to "prevent" this so far are either A). print (noticably) slower to allow more fan time on the part, or B). print the affected pieces one a time, which obviously allows more part fan time but also makes it so the nozzle never has to temporarily leave the part. Having messed with a wide range of fan speeds without much change, is there any other obvious setting I should be looking at here? Or are the two "workarounds" in section 2) above likely my best options? Thank you!!