I was in the same boat as you last year with 15 nonresident points. I decided I didn’t want to wait any longer so I applied for and drew 551 4th season 2019.
I had a good time and I was successful on a nice buck. I scouted the six days prior to my season opener and did locate some deer and decided to take my buck on opening day. I didn’t see the quality of bucks I was hoping for though.
There had been a snowstorm before third season but after that the weather was clear and mild and hunting conditions were tough. Maybe things would have been better if a storm had hit just before the beginning of the 4th season.
Was it worth 15 points? I don’t know but I did have an enjoyable experience and was able to spend some quality time in the Gunnison basin.
Since the hunting conditions were unfavorable for most of 3rd and and all of 4th season last year there are likely some pretty good bucks that made it through into 2020.
I’m pretty sure you won’t have enough points to draw 66/3.
As far as the other two units you mentioned I haven’t hunted them so I can’t speak from personal experience. I have heard some positive things about unit 67 so maybe 67 3rd would be your best bet.
A great guy to try and get in contact with is Tomichi. He has a lot of experience in the Gunnison area and was a huge help to me last year. Try sending him a PM.
You can also send me a PM if you want to chat in more detail.