kawasaki engine sems to lack power

i have a husqvarna yth1542xp with a 15 hp kawasaki engine in it. when i first got this mower it did not run it had been rolled completly over, cleaned the carb got it running, the govenor was not adjusted right it ran ramped like a race car, took it to a guy that dose small engine work and he got it running proper he says, however when i mow it struggles even on semi level ground, if im going up a slight hill somtimes it chugges like its guna stall out, any ideas? or is this engine just not have power?
 
It sound to me like the governor isn't set up right. I am not a fan of Kawasaki but they are a good running engine and don't lack power.
 
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