Hello,
So, I find the first tool in concentration/energy boosters is laughter. It works the diaphragm and clears the mind. Maybe you could leave an extra 10 minutes or so before the house opens to simply play a warm-up game, bring in a funny story/joke, or anything that evokes some laughter. If that doesn't exactly sound like your cup of tea, I suggest using your own energy as an SM (because I know I'm usually bursting with adrenaline before calling a show) to bring up the cast to your level. I also find that talking about the show, such as asking them if they have any questions about cues, gets actors in the correct mindset before house opens. I definitely feel disconnected from them once I'm in the booth and they're backstage; but you can always use your ASM's to keep an eye on them.
Hope this helps,
Lindsay