How do I keep the nozzle/hot end clean while printing PETG?

[curious aardvark]

number of issues that i can see.

movement speed way way way too fast.
Set movement speed to the same as the print speed or at best a little faster, and it cuts down on sudden changes of speed which can cause filament 'spikes' and also give the system enough time to perform a retraction.
On a cheap i3 it will also cut down of frame shake and bed wobble.

second:
try 4mm retraction distance 7 is really long. and 50mm/s retraction speed.
That's what i use on my delta, which has a similiar length bowden tube to the vyper. Albeit mine is much better positioned.

looks like you've got double z-axis motors, so best advice: change to a direct drive extruder setup.
The creality bowden setup is hands down the worst setup on the planet. (basically the vyper is an ender 3 clone with double z motors)
The way it goes from a more or less straight tube to a 180degree ubend, is just horrible and causes issues with changing friction levels and filament compression with tpu.

Anyway, back to your petg.
225 is too cool. I know that's what it says on the spool - but it's all lies :-)
I print petg at 245
85c for the build plate
and 50% fan speed after 2nd layer.

Your print speed should be fine.
With your current setup don't try anything over 50mm/s
With direct drive setup you could probably go up to 65 quite easily.
pet-g is a fairly viscous material and can be tricky.

pla is much easier to use, stronger and apart from the heat tolearance - generally a better option than pet-g for most things.

Pet-g is a tricky filament to get right, not sure who recommended it over pla for a beginner - but don't listen to them any more :-)

your print looks pretty good.
One thing to bear in mind - sanding prints is allowed :-)
Pet-g sands like a champ.
so get yourself some foam sanding blocks, don't sweat the surface glitches and after a minute or so with a sanding pad, they disappear :-)
https://www.amazon.com/3M-Sanding-Sp...T%2CB001RB20BS

those and a set of micro files are you best friends:
https://www.amazon.com/Hardened-Strength-Barrette-Crossing-Equaling/dp/B07PPYWSCY/ref=sr_1_8?dchild=1&keywords=micro+files&qid=16349 16358&qsid=141-0333490-1452312&sr=8-8&sres=B07MVW7CLM%2CB0058EDUDC%2CB0058EDUM8%2CB07P PYWSCY%2CB073XYTJ2Q%2CB07TSK23LY%2CB07QYYLH4T%2CB0 95SD9B7R%2CB092D6KFN9%2CB07KH8BG1F%2CB074DQH31X%2C B084WTHG7J%2CB0045L7Z1W%2CB07RQLBN9H%2CB07VNJWWZM% 2CB00002N5JT%2CB07WF6KZBX%2CB087FXBL69%2CB081DXD5K 5%2CB07FS649BD&srpt=HARDWARE_HANDLE