I would give at least one more day at the fat 0.5u dose before I took it up to 0.75u. Your Buddy likes bounce, so easing up the dose will be the best thing to do. This is all dependent upon there being no ketones in the urine though!
I, also, would give it at least one more day. Remember, Buddy had those same 400s on more than twice the half unit. Also, when you do increase, try to go to .6u, or skinny .75u (somewhere between .5u and .75u).