Sam, where have we been using Eishes Chayil as a ‘love song’.
Anyhow, Eishes Chayil, Pshat or not, is far from Shir Hashirim. It is about appreciation and praise, not about attraction. The words of Shir Hashirim can be used with a Yetzer Hara, but not Eishes Chayil. Eishes Chayil can be used for its Melitza Pshat, which at worst would be like using words of a Pasuk in conversation, which is constantly done. If I’m not mistaken, love songs are hardly about one’s legitimate, loyal wife.