Ok, sorry I understand now.
It really depends on which flash Swamps installed and which PCM tune you are running.
With our higher power Xtreme tunes, the milder flashes will work much better. For instance, the FICM flashes we offer for PCM tuning will only add 20-40hp or so on a stock truck. Once combined with PCM tuning, the power numbers will vary and I've seen as much as 80hp on our race truck. We have high power FICM flashes, up to 100hp, but they wouldn't be used on a truck with PCM tuning(SCT, etc.). They were some of the first style tuning built for the 6.0L trucks(2003), as we were learning.
With high power FICM tuning and high power PCM tuning, there's too much of the same type of changes. Basically 2+2=5. What's really happening is, the injector is trying to stay open too long and inject at the wrong time due to a mismatch in calculations.
In our finding's, our Performance or Inductive Heating Performance are the best match for most trucks.
That being said, if you have the lower power PHP FICM Tune from Swamps, you should be fine with any tuning.
Thanks