Excellent man! :) I can assure you that a system like this one that you implemented works quite well, as I have a similar one implemented in DSound bots as well and it is rocking! I faced all the problems you describe as well and with the amount of copycats, paid votes and the invasion from people of certain countries that just want to make an extra buck with whatever they can throw to steem, and it makes it a huge task to prevent the abuse. I tried to flag the abusing posts, even asked my community to help with flagging, have blacklists implemented, but it is just a lost battle... We need to acknowledge that they exist and we cannot do anything to prevent it, otherwise we will be building a huge system just to prevent abuse, and instead not putting our effort in favor of what matters the most, which is our community of real content creators! :) Would be very happy to chat with you about these ideas, so that we can help each other to bullet proof our bots! Good work buddy! :)