What's the best and most efficient way to display two buffers on the screen souch that it acts like the ptmask command? As in, if pixel 0,0 on buffer one is 1 and on buffer two it is 0 then a gray pixel will be drawn at 0,0. I tried figuring it ou in advance but apparently I suck at logic commands lol

So you have a 3rd and 4th buffer in addition to the primary and back buffers L6 and L3?  In that case, it would definately be difficult and maybe a bit slow.  The easiest way is to get a 16 byte block of free ram, and then for each 8x8 subset of the new buffer copy the region there and then draw them with Pt-Mask().