Onboarding Friction for Mid-Sized Proprietary Trading Firms

We're a prop firm with decent AUM and looking to expand our execution counterparties beyond the two we currently leverage. The issue isn't finding brokers; it's the sheer friction during KYB for what feels like every single one. Even with our compliance team providing all necessary documentation upfront, the process often drags on for weeks, sometimes months, with repetitive requests for information already submitted. It's a significant time sink for senior personnel. Has anyone found a workaround or a particular tier of broker/PSP that is genuinely more efficient for established, albeit not institutional, entities? Or is this just the new norm post-MiFID II/Dodd-Frank?