Alright! Your first flight today, #4, was your best effort. You were up high and you were trying to figure things out. You've got to keep elevation. You also got very luck on #4, if you hit the road at the angle you hit that tall grass, today would have ended early for sure.
Here's my thoughts, my opinions. I think you can get a full 8 minutes of flight with the skills you have right now, but you are going to need a "flight" plan. And if I were there, this is what I'd tell you to do. 1. Get the plane up high, 2. fly a very simple figure 8 pattern, where you are always turning away from yourself (do you see where I'm going?). 3. while your doing this (if you get comfortable), pay attention to any bias the plane has, rolling left, or pitching up, ect (maybe say it out loud to your brother). At some point, it would be good to trim the plane, as a trimmed out plane is much easier to fly. But it's difficult for a beginner to trim if you are in survival mode (which is where you are).
Now, I realize you need to learn to turn the plane when it's coming towards you but right now, my thought is to get you flight time, any flight time, even if it's a simple, repetitive pattern.
BTW, in flight #4, was that roll an accident or did you intend to do that?
Where you having orientation problems today?