Your coin lost much potential over BTC when BIP91 was activated. You should really come up with a new "killer" feature to favor BTX over BTC.
3% are ok, I think. By pushing it to 5% you could perhaps raise the demand a bit. But I really don't know if it matters. The most important is to broaden the user base and this is IMHO done best by getting the people to talk about BTX by giving them something new or interesting.
AFAIK the most important thing atm is to get cryptopia working again. The longer it takes the more the confidence is going to decrease and the users are going to drop their coins. I don't really know if I'm right, but I could imagine that this would be a possible outcome. The next thing should be to get another exchange to raise the volume and the awareness. But I think and hope you know all this.
Byteball is the most well-known coin for airdrops and they give people 26.25% a month
20% for gbytes linked
6.25% for btc in linked addresses so it is a bit more generous and people are more incentivesed to go out of their way to collect it
5.25% a week would be an equivalent % but the btx airdrop would still last much longer due to the greater number of coins....
Make worth considering
Whatever you are considering I think that to airdrop too many coins all together in November its quite likely to kill the coin. Perhaps to increase progressively is a better choice. And if you are in a hurry, you could increase them with geometric or even exponential progression
Why should it kill the coin? Not at all. The price will drop many times, for sure, but instead all holders will have appropriately bigger share. This is kind of a share split. Price drop is not killing the coin, it is nothing major, as holders will not lose any value.
This final distribution has to be done, so the premine will not be hanging there anymore!