I love both guitarists and Stand in Line as a whole is Chris' weakest album (by a long shot) as well as being the most derivative of Yngwie. Leviathan on SIL is a direct rip of I am a Viking, even to the point that the lyrics are pretty similar. There were a few others on SIL that also were pretty blatant. With that said, Chris said that the producers wanted to capture that Rainbow/Yngwie vibe, especially with Graham essentially utilizing Chris as Alcatrazz part 4. For those really wanting to hear Graham and Chris at their best, check out System X, they absolutely rip on that.
To your point though, I think there are only so many neo classical chord progressions built around E harmonic minor.