I propose to add a doctrine that would increase reinforcement bonus on SM infs on later escalation phases. I'm well aware that on EP1 you have 35% per model return provided by the phase and 25% more if you'd manage to get your squad alive out of the combat.
That changes drastically on EP2, though: Orks got a scrap-worth on upgraded units, Eldars got increased shields with advanced techs = the minor portion of HP's responsible for casualities, while Space Marines got nothing of it. Their infantries are basically deathsquads since EP2. It's just not rewarding enough to try and bring them back to reinforcing structure, unless they are upgraded TM's.
No, it's not a balance issue. SM got most durrable vehicles and shield provided with droppods. It's just might be the good bouns to choose from. So, ignoring EP1, how about increasing reinforcement bonus with every next phase past this one as the new doctrine?