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Rick, your 'second edit' is *** Definitely *** a very nice improvement! (You learn quickly!).
If I could make a couple more 'subtle' suggestions (To the excellent guidance, that you have already been given thus far)...
>> I was trying to keep the backdrop lit 1-2 stops higher than the subject light.
Rick, there should be no need for you to overexpose your White Seamless Background by so much (1-2 F-Stops). Try reducing this to between 1/2 -1 Stop over your 'Main'.
(Like they say... 'Sometimes Less is MORE').
By overexposing your Background over your Main by such a large amount... You are bouncing an Enormous amount of 'Stray Light' around your Studio or Shooting Area. (Don't worry... I too used to be guilty of this 'Rookie Mistake' also!).
As previously noted by Steve, all that this does... Is rob your subjects of contrast and 'washes them out' (To a varying degree)...
Rick... I might also choose to add a just a small amount of 'Additional Exposure' to the area in front of your subjects in the foreground (This of course is more a matter of 'Personal Taste').
If you should choose to do this in the future... You of course could do this by perhaps 'Feathering' your Main Light, 'Scrimming' your Main Light or perhaps even looking at this area in 'In Post'.
You of course, could also use an additional light to accomplish this (But we won't go there... As it is a Very, Very 'Slippery Slope!')... . Smile.
I still remember to this day... Seeing the work of a famous Photographer -- Who used over *** 20 Lights *** (REALLY!) on just one Subject (for a Portrait).
I guess because he could afford so many lights, that he felt that he had to use them *** ALL*** at the Same Time! (Yes... The pic was WAY, WAY 'Over Lit' IMHO)... Enough said!
Rick... Keep up the good work and KEEP Shooting!!!