Onboarding Friction for High-Volume Payments on New PSPs

We've been looking to diversify our payment rail options, especially for higher volume transactions into emerging markets, and the onboarding process with several newer PSPs has been…instructive. While their fee structures are often competitive on paper, the KYB requirements can be surprisingly opaque and seem to shift mid-application. Specifically, the requests for granular financial projections that seem to go beyond standard AML/CTF due diligence, combined with slow response times from account managers, are creating a significant bottleneck. It's making it hard to properly test their systems. Has anyone else experienced this, particularly when attempting to move substantial transaction volume early in the relationship? Wondering if this is just the new normal for compliance or if we're hitting a specific type of internal hurdle with these newer providers.