BACKDRAFT SLAVE/MASTER CYLINDER cont.. Still having issues

[Jimbocobra]

I'm stumped. My Backdraft still get hard to shift when it gets warmed up, even in very cool 45 degree days. I runs perfect for a while.

So far I have replaced the slave cylinder, replaced the fluid with high tempurature racing fluid in the lines. I re-rounted the lines from the master to the slave cylinder up and over the footbox and wrapped the line in some heat resistant foam from Summit Racing. I have a heat shield below the master and in-fact, I added some pieces to existing heat shield to fill in any gaps. I have ceramic coating on the headers. It runs perfect until it gets hot. If I keep the car moving and air circulates, it tends to run fine - until I stop at a light - so it must be related to heat somehow. The engine temp on the car does not even have to get high, even at moderately low temps some type of failure starts occuring as heat builds. I have a Ford crate 392 that runs perfectly and only has 3000 miles on it.

I have no idea what else to do. I have been on every forum and tried every solution they have offer.

I touched the master cylinder and it did not feel very hot compared to the heat shield and headers so I suspect it may not be the master (but who knows?).

Is it possible that the I should put a heat shield between the engine and the slave cylinder to stop the heat from radiating to the slave? The slave is located next to the bellhousing at least a foot behind and underneath the engine. I am also considering wrapping the master in header tape or painting it with "lizard skin" to deflect heat. Any Ideas