Sounds like you've narrowed it down to a certain DP... might share that info with us for better answers. Yes the EB are that good and a true two stage Jake brake is even better.
One trick on tight turns (without the toad on the back) is to do it in two parts. You wait too late to make it... over shooting the turn and then back up (steering the opposite direction and not hitting anything on the opposite side of the road) and then finish making the turn.
I've even had to do it in three parts for a turn that was more than 90 degrees with an obstruction on the inside of the turn.
I made my own braking system similar to the
Air Force One for less than
$50.. The
MG Brake system is similar in that a air cyclinder goes between the master cylinder and the brake pedal.