That low damage nerf was temporary and something different is being used now. The lowest damage attacks actually deal slightly more damage, making it easier to interrupt attacks even against plate. You need to deal at least 30 damage to have a chance at stagger, so as a hybrid, you shouldn't be expecting it.
With the buff to accuracy, low PT, high agi throwing is quite good nowadays due to the increased accuracy and rate of fire (outside of the snowflake weapons due to the removal of stunlock). 21-18 is still the tried and true build, but with the buff to javelins and throwing hammers, even builds down to 9-30 work well. At 21-18, you can use a throwing lance for melee. At builds below 21 strength, I recommend 3 stacks of ammo and a 1 slot spear/1h if using a 3 ammo throwing weapon or 2 stacks of the 4+ ammo weapon and the weapon of your choice. I think 9-30 is hilarious to play, but 21-18 or 15-24 are the more optimal builds I recommend.