Gear reward recast and Merit Recast reduction for bst are really 2 separate categories.
As Falkirk has stated in the guide, Gear can only reduce reward recast by 23 seconds. The cap from gear is 25% recast reduction.
Even if you have hq crafted headpiece (15s) and ankusa trousers +3 (19s), you don't get 34s recast reduction. you only get 23s.
The 15s from merits are additive but they are additive the way pdt and pdt II from things like Epeolatry are additive.
So without merits, you can have a 1:07 recast
with Merits you can have 52 seconds to recast.
I rather wish this cap were removed. having 11s from gear completely wasted is kinda annoying.
having a 41 second recast on Reward would be pretty cool.