A logline is not a synopsis. It is one sentence that makes a stranger want to spend two hours with your story: a flawed protagonist, an inciting event, a clear goal, and the thing standing in the way — with the irony visible.
The irony is what most drafts lose. 'A detective hunts a killer' is a category. 'A detective with no short-term memory hunts his wife's killer' is a movie, because the obstacle is fused to the character.
If the logline is hard to write, that is diagnostic information about the screenplay, not about your writing of loglines. A premise you cannot state in a sentence usually has two competing engines, and readers will feel the split long before they can name it.
Then match it to the market honestly. Know the three produced films closest to yours, what they cost, and who made them. Targeted queries to producers who make your kind of film outperform mass submissions by an enormous margin.