Lowering advice needed!

[vroomy]

hi guys, i have an 89 Silverado short wheelbase and i want to lower it more. I bought a DJM 2/4 drop and its still way high! i want to go down another 2-3 inches allround the front just needs shorter springs which is easy, its the back i get stuck on. If i do a flip kit it will be too low yeah? cos of the shackles and hangers. Whats the best way of getting another 3" out of it and still be able to take my Quadracer motorbike in the back without bottoming out? i thought of notching the chassis and take out the helper spring and reset the leafs but will that make it useless for carrying anything in the back? any info would be great