Idc the reasoning behind how they function currently
Grrnadier has no reason not to leave behind 2 dots for gambiting 2 blades
Stone Colossus should at minimum leave behind 3 dots, especially since it technically can clear 6+ weaknesses off of you, every weakness cleared after 5 causing the hit and the dots to be weaker anyway
Forest Lord eating up to 4 blades just for it to leave behind 2 extra DoTs is stupid
Orthrus eats 4 shields just to leave 2 dots? Nah thanks, I'd rather just keep the shields
Oni's Projection, even if it causes the cost to go up to 3-4 pips, feels like it should leave behind a dot per weakness cleared instead of just 1 dot no matter what
Meditation and Jinn's Affliction are also bad, raise up the pip cost to 4 so they can clear 2 dots for 2 hots/dots to make them even slightly useful if that's what you wanna keep going with. 
Make Trickster Oni and Verduous Jinn cost more if you feel like it'll balance out the dot situation, idc, just stop with the disappointment already.