I was bored tonight, so I finally sucked it up and made myself do 6.1.2, which I had been "stuck" on for about a month or two. I had only attempted it about three times before today and I always died on sentinel and never really put that much thought into it. I took the path with punisher 2099 with this team:

I boosted and cleared the path with cmm and aa and soloed sentinel with ghost, which was really easy. I used about five revives on the Ultron and bursted him down with cmm, but I could have cut it down a little if I cared a little more. Felt super great bashing his face after not being able to clear him for a while. Now, I am on 6.1.3 and thinking about going for cavalier. From what I've heard, 6.1.1 and 6.1.2 are hardish and 6.1.3 and 6.1.4 are a little bit easier. Then, the last two are supposedly pretty hard. I'd appreciate if any experienced/cavalier summoners could give me some insights and tips on going for a cavalier run and whether my roster could do it. Thanks!
