I have just finished playing around with mine as well, but other mods also. Maybe try and leave the setting up for longer, then go back and see the difference. I too was having surge issues around the 50km mark, but the bike will now sit comfortably in 4th and chug along. I have removed the dB killers from my pipes, so don't need any attention from the men in blue from a spluttering bike. But it really does make a difference.