I doubt that is a vapor issue due to heat, because once I could get the engine above 160 degrees, the 2F performed just fine. The stalling while coming to a stop problem only occurred from an initial 'Cold Start' until the engine reached 160 degrees.
Every time I talked with Holley, one question they always asked, "What was the fuel pressure at the carb?" The last conversation with them, before the C19, they said I either had an exhaust leak or fuel pressure issue. Knowing that I don't have an exhaust leak, it had to be with fuel pressure. I don't have a gauge, so I don't know the pressure at the carb......However, what I did know, is that my Sniper ran good before the installation of the "Corvette Filter/Regulator". With my hillbilly deductive reasoning, I figured that filter combo was messing up the pressure somehow. Note, the Sniper system I installed was designed to run with a supply line, and a fuel return line. So I plumb'd it up per their design, and it works better now.
Take this with a grain of salt: So, does that mean the "Corvette Filter/Regulator" is a bad option? The answer is; "I don't know." But what I do know, that specific unit didn't work for my application, or it is my lack of knowledge knowing how to program the Sniper to overcome the problem.