I would go with:
speed basic-11.0 12.0 18.0 24.0 36.0 48.0 54.0 m0. m1. m2. m3. m4. m5. m6. m7. m8. m9. m10. m11. m12. m13. m14. m15.
power client local
channel width 20
channel 2412 (1) ( 2437 6, 2462 11)
station-role root
Basically, disable all rates below 11. This shrinks the cell size which can help if a client is 'sticking' to an AP instead of roaming when it should.
Steve
HTH,
Steve
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