Dont know if your still having the lowering issue , but i have a #4 Kouba Link on my 450X , it lowers 1.75 in. you have to set your sag at about 80-85 , and raise your forks in the tree's to 6mm above the clamp , and the bike will be balanced front to rear, and you will have no issues , if you dont raise the forks the bike will be unbalanced and not turn worth a crap and will just not handle right, trust me i tried it and you will be very unhappy if you dont move the forks to keep the bike balanced front to rear , i also got a new Seat Foam and then cut a step in it , that way its about 1/2" lower and i have some real cushy foam at the rear when i need it , i am 5'10" but i only have a 32 inseam , all my height is in my body , so i have the same tip-toe issue , the link helps tremendously when trail riding , especially on switchbacks !
In the second pic you can see how far the forks are up in the clamps
