My suggestion:
Choose a select group of moderators that you feel can judge flash objectively. Give them the power to judge flash they deem unworthy of protection status.
1. One moderator judges the flash to be crap which puts it into a judgement folder for review by the other moderators.
2. The other moderators review the these flash at a time of their choosing with flash being judged according to the majority vote.
3. The flash is either deleted from or restored to the portal. You could add a ban for flash determined to be spam.
It's a little extreme but it's an idea that could work. I think it's a fair idea, especially if you check on your moderators from time to time and keep them fair.
Also raising the bar a little on the 1.6 wouldn't hurt either.