Definitely push your scrolls for one color. By the time I get to the High Peak Castle, I want to have at least 20 scrolls in one of the colors. When you push your scrolls in one color, and then collect (at least a majority) the same colors, your HP is stronger.

Here's a tactic build I'd suggest:

+ (insert whatever tactic melee or ranged weapon)
+ Hokuto's Bow
+ Sinew Slicer
+ Double Cross-bo-matic