Since you're also on Oahu, I'll respond. Kind of. You're going to need to provide a lot more info to get an idea of what might be going on with your car. That picture leaves out a ton of information (e.g., miles/condition of car, confirmed no leaks around the intake manifold, etc., a/f ratio during the pulls, are they showing STD or SAE, correction factor). There can be a lot of variance between dynos, so that's why most people agree that they are tuning tools... I don't know if RAD's is generous dyno or a "heartbreaker" since I've not used their dyno for my stuff.
I generally agree that regardless of those things, there appears to be something going on with your car as 400 whp on a dynojet for a tuned LTH car is low. However, you just haven't given anyone any information to take a stab at what that is. Are you sure the tune you have was written for the LTH?