Experiences with PSPs and Liquidity for Crypto Payouts

Anyone else finding the landscape for PSPs handling crypto payouts to be a minefield when it comes to actual liquidity provision? We've been evaluating a few options for enabling direct $BTC and $ETH payouts for our users, and while many offer the rails, the true depth of liquidity at decent spreads for larger volumes is often elusive. It seems many are aggregating from the same few venues.

The onboarding and KYB processes are fairly standard across the board, but I'm particularly interested in hearing about others' experiences regarding the real-world impact of their chosen PSP's underlying liquidity on client payout execution. Are you seeing significant slippage during peak hours, or are you generally able to move reasonable block sizes without major spread widening? It's a key factor for our cost model and user experience.