Hollow palm is weak, not worth using.

The Hollow Palm Technique Keystone now Grants 1% more Attack Speed per 75 Item Evasion Rating on Equipped Armour Items (previously 25). Base unarmed attack time is now 1.65 attacks per second (previously 1.4).

1% per 25 @ 1.4
1% per 75 @ 1.65

500 EV
old (20%): 1.68
new (6.67%): 1.76

1000 EV
old (40%): 1.96
new (13.33): 1.86

4000 EV
old (160%): 3.64
new (53.33%): 2.53

So, if you have really low evasion, you got an ever so slight buff, but if you play normal and have normal gear, HPT now has 30% less APS.