Yeah, the timing all depends on what tune you're running (Street, Performance or Race). Typically 26-27 degrees on 93 octane is what we're after at WOT for a 2011 5.0L GT.
When you're saying bogging down 1st to 2nd under load, is that half throttle, full throttle? "What should the timing be" is an open ended question until we know a little bit more about what the issue is. Auto or manual? Octane? Which tune are you running? Does it do this stock as well?
It might be shifting into 2nd too quickly at that throttle position, it might be torque converter, it might be a factory flaw that doesn't change with a custom tune. Let me know and we can dig a little deeper into it!
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