If it’s the affidavits alone that are what is holding this all up, unless you have very minimal other evidence, I would consider whether they are actually worth it. Affidavits are fine, and can be nice supporting evidence, but there are definitely better documents out there to show a bonafide marriage and life together. We only submitted affidavits because as a young couple without kids, joint owned property (we rent), or substantial assets, I felt we needed more extra padding wherever we could get it.
If you have a decent amount of other types of evidence, and the affidavits are going to be what makes this a 4 month wait versus a 1 month wait, I would consider just filing without. Especially with what you’re saying about the statements being written completely by the lawyer and just signed off on by the parties, and not their direct statements. In the chance you end up getting and RFE (which you might not!) the delay could potentially be the same that waiting for them to be completed anyway. You could also always bring them along to any interview if you end up having one.