They're also increasing battle fatigue from 30% to 50% healing/absorb reduction.
Lets take a 100k heal before battle fatigue and pvp power, with the person having 50% pvp power (hybrid)
Currently that 100k heal (with 30% battle fatigue)would be calculated as: (100*0.7)*(50*0.25)=78.75
In 5.3 (with 50% battle fatigue) that 100k would be calculated as: (100*0.5)*(50*0.75)=68.75
Even with 60% pvp power, you'll end up healing more in 5.2 than in 5.3.
So in 5.3 hybrid healing would be less than it is now.
This is of course if my calculations are right. My math skills aren't that great