You ever try mixing grout without a proper bucket setup? I ditched my paddle last year after a mud job that just wouldn't come together right... turned out the cheap plastic bucket was flexing too much and messing with the mix. Swapped to a stiffer bucket and a flat trowel for the final stir, and it made a huge difference. Paddles work fine for big batches but for small stuff like grout, you get way more control just folding it by hand if you've got the right technique.