I would recommend starting with the 50/50. Maybe you could go 40pg/60vg at the highest. But try the pg/vg ratio first. If anything because pg is a slightly better flavor carrier you may get away with a percent or two less flavor concentrate.
Just remember that mtl is different. You won't always get the full stage of flavor. So we'll design 1-3 dimensional flavors are better. Especially with fruit. On the flip side some tobacco flavors I like better on the mtl setup. But for me with complex fruits with cactus and other enhancers I find get lost.
This rambeling post has been brought to you by wild raspberry mf cheese cake. Personal mix v4. First on the wild side. Lol