Hey s1362083 , I think we're doing the same thing.

Are you using multi-city tickets? I see your tickets cover multiple destinations.

Also, I have learned from experience that even though IB is willing to sell you a RT with such a short turnaround – it does not necessarily guarantee a sensical transfer. An example of this was Malaga (AGP), where I found myself sprinting back to the regional Air Nostrum gates (after re-clearing security), only to make it seconds before the gate was closed.

I've started compiling a list of Spanish airports and their transfer setup, for personal use. Attached the current list I've compiled.