At some point I took some core off mining because I was affecting difficulty for myself
Actually what I meant was that difficulty was so low there was no point using all my cpu to mine. I could save power and get almost as many coins with fewer cores because difficulty was so low
But then difficulty rose fast for the reason you explained. Pity I thought the coin was gaining in popularity but it turned to be just one person
3 million coins is a lot to mine whatever the difficulty. You need almost 100000 solo blocks so it would take you months even if you are the only miner