1. VPN but the best way is to reset the modem/router and get a new ip.
2. I don't have any experience with USA stealth, I'd say that if you stay low and don't hit the limit you don't need to give them the SSN.
3. Avoid false documents and only give them when you have to.
4. I use dreamweavervcc.com and never had any problems + he's on mpgh too (https://www.mpgh.net/forum/showthread.php?t=1135793). He only accepts btc if you are not trusted on mpgh.