I think you should just be you!
I am always myself. But I can't be grumpy when I'm writing a review for a game. I am quite harsh even normally whenever I write the first post. But when I am grumpy, I get really pushy, which not only decreases my credibility, but makes me look just plain stupid. This is what I meant by controlling my attitude
Don't critic while grumpy. Avoid grumpiness by doing cat therapy. Works for me. Now, for real. Do you say lies when grumpy, or are you just a little more direct? Because if it is direct, people need to accept it, no matter how harsh it may sound.
I don't say lies. I would never lie while criticising a game, since even in my grumpy state I'm trying to help. I'm more direct, make more grammar mistakes and the whole post is sometimes chaotic. But the grumpiness itself doesn't really influence my opinions too much to be honest, only the form I present them.
Then there you go, no need to change. I mean, kinda need to look out for spelling mistakes xD but we all make those, so... If you are honest people can't complain. Keep doing it like you do.
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