A few things I have found for printing in PETG
Increase your initial layer height, you do not want to squish the first layer onto your build surface too much or you will have a heck of a time getting the print to come free once done. Also it can curl back and stick to the nozzle making a huge mess.
If printing on glass put tape down as the PETG can take pieces of glass with it when it cools (I have two build platforms with craters in it from this lol)
Use an all metal hotend for the higher temperature but decrease the retraction distance to help with clogs. If you still get oozing/strings play with your temperature, try decreasing it in 5* increments.
I print with both PLA and PETG equally, not on an MPCNC but on both a I3 clone and a large Corexy (I3 clone is direct drive mk8, corexy is 600mm bowden) I can say i like both of them for the ease of use and they seem to compliment each other. PLA is strong and fast to print with(50-100mm/s), PETG is tough, has a little bit of give and prints a little slower (40-60mm/s)
My first post so I hope it helps
I have been printing for a few years now so I have a little bit of knowledge bouncing around up there LOL