Not quite sure what you mean by "more effort". There is always more effort on the upshift than coming back down through the gears. Or are you talking about the "honda clunk" you get sometimes when shifting? Perhaps you can give us a little more to go on..
One other thing about the heel toe shifter bushing. Mine was a tad too large so I took my dremmel and shaved it down just a wee bit when I re-adjusted the bushing (12:00 & 6:00 positions for the screw allignment). Good bye sticky shifter!