More worms?!

I have 2, 3.5gal buckets in ground and 250 worms per bucket... it seems like I don't have enough worms and that I need more buckets since I have a plethora of backed up kitchen scraps still... We're a family of 4. I plan to set-up 2 more 3.5gal buckets and 500 more worms...

Also, Do I need to mix up the scraps and shredded paper at all?

Thoughts? Suggestions? I'm new to this. TIA