Bark;
Not sure what you mean that your high speed Needle became harder to turn?

So lets start here! Just a little Trick, take and screw in the low speed needle all the way till it stops.(The little screw that is inside a round ring). Now take a piece of fuel tubing and attach it to the fuel nipple on the carb and while blowing in the tube start backing the low speed needle out (Just until you hear a slight hiss of air coming out of the Carb). Now leave it there this is your low speed starting point for idle. Now remove that fuel tubing and hook up your tank to the engine (main line from the clunk to the carb and the vent line to the muffler) adjust the High speed needle all the way in clockwise and back it out approx 2 turns or a little more(This is a real rich setting). Now start your engine with the throttle about 1/4 open it should start. Once you have it running advance the trottle to full which will be slobbery rich and start easing the high speed needle in until it peaks and you hear the engine Sag/Lag on the high end back the needle off about a half a turn. Engine should now be running at peak. Now lower the throttle to the idle position it should idle now. If not you may have to adjust the low speed needle 1/16th to 1/8" in either direction to get the idle set just right.

Hope this helps you understand a little more.