what do i have to adjust to fix this problem?

[blueb8llz]

ok this is frustrating me, im in and out of my house keep trying to adjust my toe in on my front two 2 wheels and still cant get it down. my problem is this,
when i go about 10mph, its goes completely straight, but as i speed up to about 20 to 30mph, itll just hook to the left or right...not a very sharp hook but itll just start leaning one way and then if i turned the opposite direction, itll go that way too much and ill lose control. i know about the steering mod , but the thing is, this was not a problem until i got new rims and tires. so i know its fixable but i just dont know what to adjust.
one major thing is when i go reverse like going 2mph. it wont go straight...it will always reverse towards the right.
can anyone please help me