That's once of the problems of leds. Getting a 2-tube t5 would be a better choice since Vega lacks violets, you can get ATI actinic or blue plus to supplement. Adding another Vega would definitely be too overkill.
Another solution would be to change out to another better light set. Probably a razor 120w. With 2 separate cluster. You'll likely get less shadow and also better color/spectrum den the Vega.