I have a special love for subverted tropes, so I'm definitely going to look up Venetia! But I also really like the other things you mentioned, so these all sound like fun :)
Speaking of the heroine shooting the hero (or at least drawing a gun), have you read the manga / watched the anime Fullmetal Alchemist (FMA:Brotherhood)? I think it would be directly relevant to your interests! There may be scanlations available online, or I think at least part of the anime is available through Netflix... It starts slow and a little weird, but after that builds up a lot. (It's more like Bujold than like Heyer in terms of tone.)
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Speaking of the heroine shooting the hero (or at least drawing a gun), have you read the manga / watched the anime Fullmetal Alchemist (FMA:Brotherhood)? I think it would be directly relevant to your interests! There may be scanlations available online, or I think at least part of the anime is available through Netflix... It starts slow and a little weird, but after that builds up a lot. (It's more like Bujold than like Heyer in terms of tone.)