I have had 4 low card str8 flushes and 1 royal in live poker
Your low card ones weren't all to the 6 though were they (I'd guess)? I'd agree at showdown the royal is possibly the most likely SF. But any 5 random cards are as likely as any other otherwise. But I'm sure you already knew that.
A certain poshboy won a pot off me once donking the flop with "60% of a straight flush draw", having peeled pre with the

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flop and he donks into me in early pos...

