My apologies for taking so long to get back with you, I saw that you wrote just before I started work.
In answer to your questions, first and foremost I never stop and accept the answer no. I don’t have all answers yet, but I look at things and say to myself okie how do I make this happen.
That said a couple of links
and importantly
With these two I just kept playing with it until it worked. My first pie took 3 passes and about 35 to 40 minutes to engrave. Most pies you have to take out the crumb tray. in fact the only food stuff I’ve engraved that didn’t need the tray out is pancakes.