Please less than 100 peer. What is your internet connection speed?

So I need to put the 8616 in Bridge mode before and later setup the PPPoE in my Windows? You are right. How can I later access the 8616? Should it still have the 192.168.1.1 IP? Sorry I don't know....

LINK - and bridge configuration on your TP-Link. LINK

I don't understand your network configuration. It follows that you have two routers (two NAT)? Maybe give us scheme your network.

When you configure DMZ on your address IP is everything visible on the outside.

Please to try down your peer and upload parameter connection in torrent application.