I use Maxbright II. I think that comparing EPs and FLs over different configurations is not that useful, so I will stick to the exit pupil (leaving aside that it gets split in 2 etc).
In Lunt 80 I have used Maxbright II with 2.6 GPC (it is a must for reaching focus) and BF1800 (otherwise you will vignette). Actually, even with BF1800 pushing up will vignette some other circle (a bit, really, but I expect that other BVs do that, too).
2.6x GPC translates, according to various measurements, to 2.5 to 2.6x in various refractors, so you are getting 1400-1450 focal length, so f/18.
I have found that 25mm Vixen NPL plossls work great (around 57x), would be 1.4mm exit pupil. I see the whole disk and then some around it. 32mm plossls work too but the eye relief becomes a bit of a problem, too much of it.
I used 18mm Fujiyama orthos (80x, 1mm exit pupil) also, the view is dimmer but still very good if the seeing supports. I use them whenever the seeing supports.
I've tried 12.5mm Fujiyamas, but the mag is for great seeing only (115x, 0.7mm exit pupil) and the view is dim, perhaps for zooming in on some prominence details, but I find that I see all that really at 80x and that seeing is very very rarely going to support 115x.
In sum, 1-1.5 exit pupil is where it is at for me.
As for slight vignetting, Lunt BF has strange overlay. For MB users low profile Baader eyepiece clamp can be used, I measured that it saves exactly 3mm of focus, which is the amount needed not to vignette upfront (BF is not a problem, I repeat). In any event, vignetting is not noticeable at the eyepiece.