I’m no native speaker, maybe thats the reson why I’m not realy able to understand your first sentence meaning. What I meant with “perfect settings” is: I can print without stringing and oozing with them, PLA and also PETG. But they might be different for you, for example if you print a lot faster then I do.
Yes, it seems as you are mixing up z-hop and retract. I would leave z-hop alone in the first steps, it might be useful but it can also introduce new problems. I wouldn’t enable it as long as there are other options to eleminate your problems. So if I’m speaking about 1mm retract, I mean how much filament is retracted upwars, not Z-hop.
You will not be able to find my settings in Cura, as I use FW (Firmware) Retraction which gives you a lot more options. You need to enable that in Marlin if you want to use it, and also switch to another slicer as Cura don’t support it at the moment. What you can change nevertheless is the retraction acceleration. But not in Cura, it’s in the LCD menu of your printers settings.
OK lets go through some of your questions:
Print speed:
80mm is a real high value. It can be achieved, but you realy shound’t start with at as long as you have not dialed in all your settings to be nearly perfect. As Brent said before, thats also only the default speed which is modified from the values in Advanced Tab. Start with the settings from Lulzbot PLA profiles and leave it alone until your prints are perfect. Then you might want to increase them.
One of the problems with high speed printing is the increasing nozzle pressure, which will increase also oozing and stringing problems.
The mountain print in your example will have no problems with stringing because of it’s completely different nature. There are much less travel moves, and each travel move happens after a decent print time, while in the parts with stringing you have very small print times and again travel moves after them. It’s important that you understand the mecanism behind that before you start to modify your settings or you will never know why a change improved your print quality and another one doesn’t!
Z-Hop:
I meantioned this before, my recommendation is to disable it for every print where it is not absolutely necessary.
Nozzle Temperature:
The right temperature is also depending on your print speed. If you want to print at 80mm/s, you need more temperature to reduce nozzle pressure and a clean filament flow as if you a printing, say, around 40mm/s. As a start point, 205° at about 40-50mm/s for eSun PLA is quite good.
Cooling: As low as possible, as high as needed. More cooling means weaker layer bonding and sometimes also more stringing.
I realy recommend you to read the following articles to get a better understanding whats going on:
Retraction: Just say no to oozing
Extrusion temperatures and limits
About cooling settings
Strategy about obtaining great prints. Realy, read this!