pack giveaways

Imo, contact support.

Nah it's fine to do that. It's an unwritten law that you don't enter a bundle pack if you have the majority of the games. I would say 1/3 might be a tad too low though, 50% or greater strikes me as better.

State your rules clearly.

If some dick breaches them due to lack of comprehension skills or more commonly, trying to pull a fast one, ask support to reroll.

Your game your rules.

Don't be nice to people on Steamgifts. You will only get taken advantage of.

I'm not sure if this counts as a special rule giveaway or not.
For special rule giveaways you have to contact support to see if your rules get approved, but you cannot create special rule giveaways and mark it as a public one.

But then again I've seen public giveaways that have said "Don't enter if you have X number of games/dlc".
I'd contact support just to be safe.

To the admins!