Not aware of a 2.5 King Coil-over bolt on kit. or bolt in By pass set up but I could be wrong. Little more information would be helpful. Are you running Coilovers and Bypass shocks? Are they valved for your rigs weight? what company supplied them?
In my build I started looking at IBP king shocks, but due to initial specs for mounting the IBP would not function correctly. For your set up how is it set up? a by pass shock needs to be tuned. A coil over shock needs to be tuned. Spring rates need to be calculated.
On my heavy JKURR I run a 2.0 King Coil over with 300/250 springs in the rear and 300/225 in the front. On street the compression adjust is set at 5 (scale of 1-20) no load off road it is set at 12 and combat load out set to 20. Road manners are amazing. Trail performance is top notch.
there are calculators that will help with set up and spring rates but you will need to know some information up front. Weight of the vehicle. This can be determined if you already have precision springs by measuring the delta between full extension and ride height. This will give you the weight on that corner. From there you can tune the system you have.