Welcome Paul, there is a great community of vapers and VMODers in particular here on ECF.
I've been vaping Bobas (which is 100%VG) in my VMOD XL for a while now and it feeds ok. I'm not going to say perfectly, you need to squonk it pretty firmly but it does feed.
I've employed the tilt-squonk. They (Vapage) recommend a tilt, watch for the bubble, return to upright and squonk. I tend to do a tilt-squonk where I tilt, then when I am returning to the vertical, I squonk.
It takes a few tries, you will get dry hits, you will flood the atty no matter which juice you use. It's a learning curve - just persevere and you'll get it.
However, since I got my VMOD, I pretty much have all of my other vaping gear sitting in a drawer gathering dust.
Liquid Feed APV Discussion You'll find some great discussion about them (and other liquid bottom feeders) by clicking the link.
Oh and by the way, 50/50 feeds perfectly.