Those little drips are a pita @
yomny. Hate to say it but really common with aftermarket turbo installs. Best thing I can say is don't use paper gaskets and clean the heck out of everything with brake cleaner before putting on any sealant. Then careful with the torque. Overdoing it will have the same effect. It is a low pressure system on the drain side (and coolant side really...) so you don't need torque so much, but a broad clean surface for the gasket maker to stick to and not lift off.