Yes and yes. Always wired to the router regardless of either hub3 or third party. Ping is still a consistent above 60ms whilst a friend who is not on virgin three doors down gets less than 10ms in game ping.
The SH3 is useless for gaming. Does not have the computing power to cope.
I have been in Modem mode since 2011, when the first SH came out, in that time I have had 2 ASUS routers, and both improve my gaming.
-- Red (VM SH2 AC Beta tester) Running on 350Mb VM service with SH3 in Modem Mode, with a ASUS RT-AC5300 router. With this setup I get Fantastic WIRED and WIRELESS Signals in my home. I dont work for VM. But I work in IT, and I know my tech. My advice is at your own risk.