I like to use FK 425 as a QD over my LSP. My prior LSP was AJT and my current LSP is Opti-Seal. BTW, FK 425 is relatively cheap since it is $27/gallon and only $5 for shipping. It is hard to buy high quality OTC QDs in bulk.
FK 425 provides that extra pop and slickness while also giving an anti-static coating that really works!
Just my 2 cents.