Clive,
Firtly, I'd like to congratulate you on your dancing. The pair of you in the shopping mall are clearly having a lot of fun, it shows in spades. Not a bad pair of movers either.
On the matter of diffuser's, if you're bouncing off the ceiling I don't think it will make a lot of difference, except losing you power, if you use a diffuser. The home made Lumiquest seems to be doing a good job and as long as your gun has the ooomph to cope with it then I think you'll get better results than trying to bounce from an unfeasibly high ceiling.
In the 2nd picture you've attached, the bloke in the orange shirt and his partner have a great poise.
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