Don't forget you got a timing chain tensioner. unless your chain has stretched to the point the tensioner is fully extended then the type of cam makes no difference.
The biggest beef I got about gy6 cams is there is no specific specification for the cams , only a number, no duration, lift or overlap specifications so you really don't know what or how a particular cam affects the motor. Only way to know is to put your particular cam under the dial indicator. Even manufacturers have their different idea of what makes a torque or hp cam. The same number cam from separate sources can be a different grind! The machining tolerances are so sloppy two cams with the same number from the same source can read different
It's possible, if your A11 has a high lift that you may have busted a valve spring when you stalled. A broken inner spring would not be noticeable unless you were looking for it. The valve would still function but would react sluggish resulting in your lack of performance.
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