this is actually a good plan, & I agree that some judges are too lenient, & a lot of judges fall for a smooth talker. & then somebody like Hope, who is ill mannered & rough, is disregarded. I have a feeling that Ron's demeanor, is how he got out of so much past trouble. He could talk the talk.
Giving judges full discretion does not work either just for the reasons you stated. Some people could talk their way out of it and some judges would show favoritism; this kind of thing happens in courtrooms in this country every day.
With tiers at the lower level, the young first-time offender would get 3 years and that could be served as probation...if they mess up, they do time in prison but at least it gives them a second chance!
Mandatory 3 years in prison could be for first-timer who is older, with no priors, or a younger person with priors, etc.
Mandatory 5 could be for subsequent offenses with extenuating circumstances of some sort (minimal priors record, has a job and standing in the community, etc.) The mandatory 7-year level could be reserved for a second or third offense where the person has no job and has a
long list of priors (not just drug-related), etc.
Fifteen-year minimum could be for violence during the transaction and for bigger-time dealers, things of that sort. And 25+ would be reserved for the big fish.
My main concern, however, is that for some offenses we allow judges
full discretion while for others we allow them
none. Even I can see the flaws in that system, and I'm no rocket scientist!
ETA: What I describe above are just my own thoughts on how the laws might be revamped to be more fair and to give those who deserve it a second chance, while holding the worst offenders responsible. IMO, it would not be difficult to have mandatory minimums that make sense.