Ellen Tigh: As far as we know for sure, Ellen Tigh doesn't even know she's a Cylon until she's resurrected when Saul poisons her on New Caprica for collaborating with the Cylons. Prior to that it's ambiguous (I've deliberately used the same word you did, but I hope it's clear I'm making a different point) whether she knows or not. She may do, she may not. As such, we don't know whether her manipulative promiscuity, etc is part of her Ellen Tigh character or part of her Cylon character.
Sharon "Boomer" Valerii: The first Sharon on the Galactica doesn't know she's a Cylon until she "activates" and shoots Adama. Prior to that, her sleeping with the Chief is part of her actions as Sharon, not as a Number 8.
The Sharon on Caprica, who sleeps with Helo, I will grant you. She knows she's a Cylon, she knows her mission. However, she is only using sex to get... sex. She wants to become pregnant so she needs Helo to fall in love with her and sleep with her or whatever.
D'Anna Biers: No dice. Doesn't really attempt to manipulate anyone, sexually or otherwise.
Tory Foster: Nothing until she finds out she's a Cylon, and even then the only person she hits on is the Chief, who she was married to as a Cylon, so that doesn't really count.
Six: OK, so the main six uses sex to appeal to Gaius Baltar's vanity in order to get into the Colonial defence grid and facilitate the holocaust. That I will grant you. Shelley Godfrey, as you noted, also attempts to seduce Adama.
But on the other hand... There's other copies of Six who do nothing of the sort. Gina in particular, having been rescued from the Pegasus, appears in a considerable number of episodes without using her sexuality to gain anything.