Best sources for digging into ETF trading/mechanics - institutional perspective

I work in asset allocation and have started helping PMs review tactical ETF exposures and possible substitutes. At first there was some really low hanging fruit but now approaching the need for more under the hood of the trading/implementation side - volume, bid/ask spreads, underlying liquidity, creation/redemption, market makers/APs, basket mechanics. I understand the basic concepts, but I’m trying to build the practical judgment to assess when each one actually matters and how to evaluate tra