I would say robin hood hat, leather body, black d hide chaps, black d vamb/mithgloves, fury, ranger boots, archer ring (i) blowpipe best darts for best possible xp and finally avas.
I think thats xsplit right? Use OBS and that might fix the problem. Check your internet speed @ http://www.speedtest.net/ and give your results. It is reccomended to stream at the speed of under half or half of your upload speed.
Hope I don't jinx myself but I have only received 1 (2-day) ban and that was on deadman mode in about 3 months.
I also don't really know how much your pc can run since I'm not an intel geek however I would say around 2-4 mirror clients. Ram isn't an issue and the cpu is good but the clockspeed is unfortunately low.
I would suggest not using mirror mode if you are going to run a farm because if you can run 5 bots with mirror, you can run 8-12 with regular client. I have been using proxyblaze for over a year now using over 200 proxies of theirs. I would reccomend them since they price their proxies fairly where you have access to 10 proxies for a month at a price of $16.