I have a buddy in Texas that has had both JB4 and Procede and got deep into custom tuning with both of them.
He said the potential is far higher with the Procede, even though he agrees that Vishnu isnt much help. He has done countless hours of logging and getting things right with his 100% E85 setup. Said it would have been impossible to get to where he is with the JB4. Just differences in the tunes I guess.
Having him already doing all the leg work with multiple tuning setups (93 tune, 50/50 tune 100% E85 tune) is what is making me lean towards Procede.