I am not sure you can improve the pockets, at least not in my case. However, I am just as happy if they don't get any worse. Mine are in the 8 -9like yours, but have stabilized over the past 12 years or so. Every 90 days cleaning is a must for me, and once a year deep cleaning.

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95 R129
04 Infiniti G35.5 BS
10 X204