Have you tried sigil bombs? Basically you set up a way to startle yourself out of trance while you are staring through the sigil. This creates a brief gnosis trigger similar to when you reach the point of orgasm during the fast hand method.
You already do; your subconscious. There isn’t really any way to power a sigil post charge and release that I know of, namely because the sigil is gone in the method I use, usually burned. I like to burn a bit of dragon’s blood when I burn my sigils, and mix the smoke from the two as the sigil burns. It seems to work well as a booster, most likely because it helps create a better impact on my subconscious and also possibly because dragon’s blood can act as an empowering agent.
I would steer away from that. Having something like that around, or just knowing it is around, plus maintaining it will make it harder to get one’s mind off the sigil and ritual, therefore possibly making your efforts LESS effective. I don’t even charge and release my sigils until I have already forgotten what they mean in my conscious mind. It’s hard to lust after results when you don’t even know what the sigil you released is for, lol. It might sound counter intuitive, but it works.