I have a 2h15m layover (1300-1515) in Istanbul next week on separate PNRs - inbound from TAS and outbound to LHR (traveling for different clients so it has to be different tickets).

I've transited and arrived/departed in Istanbul many times as E/E+ but never had to do a quick pick-and-drop baggage shuffle like this.

Are there any particular tricks or shortcuts that I need to be aware of to make this go smoothly? What is the best way to get from arrivals to departures (ideally the Premium checkin area) quickly with one checked suitcase? I will use the FastTrack immigration of course as E+

Also, what are the chances of Tashkent agreeing to tag my bag all the way through to London despite the separate PNRs? I have had success with TK tagging me onward to other *A airlines on separate PNRs but never tried TK-TK connections.