I use mosty pg/vg blends but have used plenty of all vg thick over the yesrs. Never had any issues with vg and REOs.
It's been a couple of months since I've used my ERAs and Hornets because I'm so in love with my Greek RBAs but remembering for top cap hole RBAs I judged how much to squonk by squonking on a still hot coil, not firing button, and judging by vapor release up out top. Seemed to work fine. Only issue is I would sometimes flood the RBA a bit and juice would occasionally leak out of cap hole.
In 2010, when DH was using 801 pen style with cartridges (not cartomizers) I thinned his 100% VG with PGA or tiny bit of water. Those were the days of doing a straw mod to the carts to get them to feed the atty better.
Feisty Alice
(edit) .... forgot what I was going to add. Appointment here..... may remember later.
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