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you decreased the AF ratio through the pilot system. this means there's a bit less going through as your needle opens up the main jet. so if it is now struggling from 5k to 7k, your mid range is too lean. raising the needle will push more fuel into the carbs through 5k to 7k.
however, like dablue1 said, if your main jet is too small, you're still running lean up top and dont have the power you should up top. increasing the main jet will increase the flow through the needle along the entire range of the needle (which includes 5k to 7k)
the fact that it gets better once the main opens up all the way tells you that your needle probably is slightly too low, but whether or not it would be too low after you bump up a main jet is hard to say. whether 'too low' is more or less than one clip size is another question you wont be able to answer without trying. you really should do a WOT plug check to see if you are lean up top, then go from there. if you are lean up top, increase the main jet and it should fix the entire range. if you arent lean up top, raise the needle one clip.
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