Question 3. Have any of you managed to get an IEM solution that works for you, particularly on high gain sounds without being too ice picky or just sounding nasty in your ear? I have a couple of IEMs and different IEM amps I can use. Back with the AX8 I tried mixing a direct feed of my guitar with a mix of the band from the PA....but I couldn't get anything I liked.
When it comes to IEMs, it's really about the quality of your IEMs almost more so than the quality of the profile (almost). If you're using single or dual driver IEMs, I don't care if God himself came down and created a profile; it's going to sound like crap and very thin. At a bare minimum, you need to be using triple drivers. I'm using 5-driver Westone UMPro50 and they are awesome! They sound better than my AudioTechnica headphones.
You've also got to set realistic expectations for what IEMs can do. You won't get that amp in the room feel from them because there is no amp pushing air at you. But if you get some really nice IEMs, after a few gigs, you likely won't have a desire to go back to amps. You can crank them to the point where they play a trick on your head and it sounds like you've got a cranked amp in the room (without the air). But, keep in mind, part of the point of IEMs is to protect your hearing.
I made a gradual change over time, reducing my setup from a 1/2 stack, to two 2/12 cabs, then to 2 1/12 cabs and finally to the in-ears. So my adjustment to them wasn't as drastic as someone who is going from a 1/2 stack right to the in-ears. But the one thing I love about them is that at every gig (we use the Behringer X32 as well), my monitor mix is EXACTLY the same, at every club, at every spot on the stage. The entire stage is a sweetspot for me now.
I'd highly recommend the 4 or 5-driver in-ears from Westone. Sweetwater carries them.