I think only 10% more coins for POP is to low, if you want effectively avoid dumping. I don't think that this will discourage the most holders from dumping the coins on an exchange, if they want dump.
I think you should do the POP more individual.
For example:
Showing that you held onto at least 50% of your coins, then you will receive an extra 10% of coins each week.
Showing that you held onto at least 75% of your coins, then you will receive an extra 25% of coins each week.
Showing that you held 100% of your coins from all weeks, then you will receive an extra 100% of coins each week.
I also think that the reward of 10% more coins for a 0.1 BTC buy is to low. Do you want that the coin will be successful? Then I think you should give better rewards to the supporters who will make this coin strong. I think 50% more coins for a 0.1 BTC buy is fair. But this must be done individual compared to the trading volume of this coin. But for the start with the low trading volume it is fair I think and after some time when the coin has a bigger trading volume per day you could decrease the reward.
I think it would be much better for the coin and the distribution if the random amount each week by posting your address is relatively low.
And therefor give bigger rewards to the real supporters, who hold the coins or invest in the coin. With this the dumpers who just want to get quick money by dumping would get less coins, so there would be also less dump. And the people who believe in this coin and make it strong get more.
BTW are there any requirements for getting coins? I mean date of registration of the account and/or the activity? Because I'm afraid that people could create multiaccounts and then the distribution isn't fair at all.
I think everything above should be considered. Maybe even a percentage increase above weekly rate if (for example using arbitrary numbers): 120% more coin if you've bought a half comparative to your weekly free coins? Like get 2000 free coins one week, then buy 1000 and you get 120% next week. Maybe the 120% reward would kick in if the price was above a certain point or another set condition?
e.g:
Get 2000 Yin one week and then buy 1000 Yin.
Next week get 2000 Yang and 400 Yin(or extra yang) (Optional: if price you've bought at was x.xxxxxx and above/or you've spent x amount of BTC)
Do opposite next week.
Or alternate the goal to buy half of the coin you didn't get.
Get 2000 Yin one week and buy 1000 Yang
Next week get 2000 Yang and 400 Yin(or extra yang) (Optional: if price you've bought at was x.xxxxxx and above/or you've spent x amount of BTC
Do opposite next week.
Could be a stupid idea, but thought I'd put it out there anyway.