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You will see more images from the two day workshop. I will indicate which are done with flash and try to recall where the Better Beamer was added. I would have to guess what in flash exposure comp settings were chosen, usually -2 to -2/3.
Flash was never primary light source. Anything more than a bit of fill looks unnatural and/or shows light fall-off at a distance.
Most images were taken with - flash exposure adjustment on flash (Canon 550EX).
Better Beamer only used with focal length 250 mm +. Guideline I was given was 300 mm +. For super far captures dialed up exposure comp +2-3 in flash to have some reach of flash out at 100+ feet or more.
All taken with high speed sync on.
Most useful to me was in camera exposure comp of up to +2 to shoot white birds with or without flash against a relatively light sky background.
Image above taken without Beamer, with -0.7 EV in camera, fill flash from 550EX. I am guessing -2/3 EV flash settings, but not sure.