Tips for turning on EVAP monitor

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I never had issues with EVAP turning on and only had the catalyst monitoring incomplete(at the time). I put the stock headers back on and got impatient so I reset the monitors. Well I managed to get the catalyst monitoring to complete after following some driving guidelines on the forums(kept revs under 3K, no full throttle) My problem now is the EVAP doesn't want to turn on. I've driven approx 400 miles since reset. Driving has been mostly 5th/6th gear at 65mph for 15-20 min per cycle. Does anyone know any specific tips that helped with turning their EVAP on? I mean I don't mind driving, even if it's mostly in the slow lane but I really don't want to be wasting my time if there is something specific I should do.

I have 2 stored codes P1137(clutch start, or could be O2 related. Can someone confirm?) and P0480(front rad fan, probably from the manual fan switch I installed) please correct me if I'm wrong about the problems related for those codes.

I'm getting desperate. Local Porsche dealer quoted me $250 to "diagnose" It's either spend the $250 on gas or have the dealer just turn the monitor on.