'Sup Bastiches?!
I think I figured out a way to get B+3 from Czar Toss consistently and there is a slight Easter Egg involved... Let me 'splain it to you...
Basically you want to be pressing the inputs b and 3 at the exact same time right as your opponent is reaching the apex (Highest point) of the bounce. That's when the input is necessary. This should help you get the timing down. If you input back a hair before 3 it won't come out. By doing it at the exact same time, you will learn the timing. It's definitely strict, no doubts there. If you have pressed the inputs as they are starting to fall, it won't work. You have to hit the inputs at the top of the bounce or as close as you can get it.
An easier way, and this is where the "easter egg" comes in, is to be aiming or timing it so that the shotgun BLAST, not the gun, but the blast is nearly level with their Nether-regions (nyuk, nyuk, nyuk). Basically like you're shooting them in the nards. (The easter egg being that Lobo would be the type to just cold shoot somebody in their nards). I did this combo online and was still able to get the b3 to hit most of the time (lag factoring into it I think)...
I also spent some time with the b12 d1xxdbf2 combo and yeah it's strict on timing, but nowhere near impossible. The d1 is cancelable as I tried the combo without and with release check on. To my eye, you have to hit the d1 at the last possible moment. I tried to hold d and then hit 1, but I got better results when I hit both simultaneously. Once you hit the d1, the dbf2 is easy to connect which makes me believe the d1 is cancelable.
There are plenty of combos you can do to build meter and then you can use the bb MB to bounce cancel the b12. For me, I'd rather be able to use the b12 d1 in my mix-ups, and have more mindgames.