mn3009 flanger/chorus trouble with flanger samples

[b00kworm]

Hello i made a chorus flanger effect.
But there is  a little problem
(below are schematics )



it works but flanger is not like factory chorus ex. boss bf-2 its very delicate and when i turn regen knob  max to right (to set full feedback)
its self oscillating but it's sounds like real flanger but it kills guitar signal .  i can't set it to get a good flange .

MN3009 is 256 stage delay  maybe its too short ?
this is my first flanger.
http://tuberman.republika.pl/1.mp3
http://tuberman.republika.pl/2.mp3
regards Lucas