Our CC uses a variation of the USGA system, picking an unanounced cutoff date, and taking the 5 best of the last 10 rounds played for the average that month. Then take that score X 96% (ignoring all the slope factors). However we use 60 as our base score, that being the level up average point to go to TL.
So if someone has an average of 65 from their 5 best before the 96% factor, then the nett average is 62.40. Anything under 0.50 points is rounded down. So the player has an average of 62, and a handicap of -2 for each 18 hole round. We cap maximum minus H/C at -9, and maximum plus H/C at +2.
For the purpose of creditentry fee tournaments in the CC we also rate players into A, B and C Flights. A Flight is for H/C's from +2 to -2. B Flight is for -3 to -6. C flight is for -7 to -9.
However, those tournament have no numerical adjustment. Players are expected to only play in Tournaments set up for their letter grade. We usually combine A + B, and B + C together.
While not perfect, it does help level the playing field some, combined with using default tees. However, lower tier players can still be at a disadvantage with faster green speeds.