You're probably going to take this the wrong way... but suck it up, pay your fines and move on while using better judgement next time. The cops were abiding to their state/local and federal laws. They were just doing their job, and they let you off extremely easy considering your possession amounts. Why in the FUCK did you need three ounces when you can semi-legally carry up to an ounce on you in Nebraska? Decriminalization with a $100 civil fine for that.
Profiling or not, it sounds like you could have exercised way more caution behind the wheel. I just don't have sympathy for people who complain about police when they were knowingly breaking the law but it's obviously different in the scenario of cannabis activism. Still, you broke the law and got extremely lucky with your consequences. (Thus far..)
I live in Colorado. I grew up in Kansas. I've driven I70 probably over 30 times in my life. I've never been pulled over. I've done three trips to South Dakota and Kansas this year alone and haven't had problems. Maybe I'm just lucky, maybe I'm overly cautious.
Just remember, "only break one law at a time".
Good luck with everything. Just know it could have been much worse and that Nebraska has been, at least, moving in the right direction. I knew people in Lincoln, NE who would get popped with under an oz and just pay their ticket. Everyone in my town in Kansas would got to jail for anything. I got popped when I was 17 and it was two misdemeanors and I almost got charged with DUID and child endangerment (wouldn't have held up since the cop let me drive home and I was a child.. scare tactics lol) but it was still probation and lots of fees, UAs, etc. So I feel the pain about the system being broken. I'm not defending the cops actions, just saying the OP should be a bit more rational about the situation.
Edit - I only read the first page too, so just ignore me if someone already covered this and I'm just beating a dead horse.