Finding consistent liquidity partners for options: thoughts?

Curious if anyone has strategies for vetting and securing reliable liquidity partners for a nascent options desk. We're running into issues with inconsistent fills and wider spreads than anticipated on certain exotics, even with reasonable order sizes. It feels like the market makers we've approached either cherry-pick or are too slow on response times for rapid shifts. How are others ensuring competitive pricing and consistent execution quality without jumping through a dozen hoops every time you need a new counterparty? The KYB process alone can be a nightmare when just trying to get a feel for their service.