ktm 50 clutch problems

[tyetye]

hello, hope someone can help me with a small problem i have.
my son has moved up to a ktm 50 senior adventure 2003..
when i got the bike it had the spring set up in the clutch witch i have been told starts to bit around 4000 rpm ISH.. this was far to low and the bike was bogging down,so i went over the a basic washer/stack set up witch i found on www.ktmbible.com and was told starts to bit around 8000 rpm ISH. this set up is to high and is putting the ****s in my son. does anyone know of a set up inbetween or some way of getting middle ground. i don't need hard clutch bit, my son only rides for fun and not racing.

thanks to anyone that can help me..