I just made a rather absurd build (a Monk/Cleric/Wizard) which achieved the unlikely feat of having a pre-epic BAB of only 9. This meant that, using the Monk attack schedule on a single kama, I had 3 base APR. When I cast Divine Power, I expected that number to increase to 6, which is the number of main-hand, non-hasted, non-flurry attacks usually touted by DP spammers. However, I was dismayed to find, upon testing, that I only got 5 APR.

My question is, why? Is there a hard cap on the number of attacks you can gain from DP? Or is there some other issue with the build that prevents it from getting a sixth attack? The spell will never give more than two extra attacks.
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"We keep our Feast of Feasts, sure of our bourne,
Our aims self-same:
The Guest of Guests, friend Zarathustra, came!
The world now laughs, the grisly veil was torn,
And Light and Dark were one that wedding-morn."