I stayed at legend for over 2 years. I made some credits in ready gos. here or there.
Here's the thing. All i did was avoid playing Red tee tourneys unless they were Custom courses or par 3s or par 5 courses.
So basically I didn't artifically drop my average. I played normal courses. it just takes a while to get under 60 playing regular tourneys and RGs from the back tees.
As to TL to Champion, they tweaked the algorithms for mobile. I went to champion with only 70 ranked rounds from the time I hit TL.
Bottom line.. ignore tiers.
there isn't any point in tiering up fast. Just play the game. Other than ego boosts it doesn't really mean anything,