GregValiant 1,410
That looks pretty good. A little work with an Exacto knife and some miniature files and it's done.
The answer to the first question is no, because Cura goes layer by layer. It won't make changes in the Z to finish one area and then drop back down to bring up another area. It wouldn't know if it was going to crash into something already completed. It does have the ability to make adjustments if you were to bring the fins in as a separate part. The body could have one speed setting and the fins could have a different speed setting. If you have the actual model you can do that. If your working with just an stl file then I don't believe that it's possible. What you could do is add an M220 line in the gcode file at the layer where the body runs out and only the fins are left. If the printer was running at 100% feed-rate you could add M220 S75 and knock the speed down to 75% (or whatever works).
Stringiness can be a function of temperature (too hot), retract distance (too little), material, or even color. Silver PETG can get pretty stringy while black isn't near as bad.
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Framar 38
To your second question : You can use modifiers to change printing speed for a specific area
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