Yeah, that's what I'd push for. That, and restricting the levels of heroic strength based on tier. A scout getting heroic strength II is ridiculous. Similarly, an Immortal being restricted to heroic strength II is also strange. I'd suggest making heroic strength I give 1 strength, heroic strength II giving 2 strength, and heroic strength III giving 4 strength. Then, restrcit heroic strength I to tier-2 units; heroic strength II to tier-3 units, and heroic strength III to tier-4 units. It would make a bit more sense, in my opinion.