[3.5]Mounted Combat

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So I have always been very intrigued by the relentless shield ability of the ashworm Dragoon as it replaces your mount's ac with your ride skill. Are there any other prcs or feats that enhance the number of times per round you can use mounted combat's ride check in place of AC, or maybe an item?

I have looked around with no avail but I don't have all the books so might be missing something...

[daremetoidareyo]

Aglarondan Griffonrider

Improved Mounted Combat (Ex): At 3rd, 5th, and 7th level, an Aglarondan griffonrider increases by one the number of Ride checks she may attempt each round to negate a hit against her mount (two times per round at 3rd, three times per round at 5th, and four times per round at 7th). The hit is negated if the griffonrider's Ride check result is greater than the attack roll.