Welcome to the site !
There are lots of things you can do to make the bike a better woods bike
To get more "easy to ride power" delivery i would suggest a flywheel weight and/or even a steel clutch basket , this will give the engine a smoother power delivery , along with the Rekluse you mentioned , it will allow you to gear UP , so this will also increase smoothness , none of which will take away any power , just smooth it out
Also going UP on the gearing will smooth out the power delivery
I am not sure on the CDI since the wiring is completely different from the X to any R , since the X has a charging and lighting system , maybe PM Ken , the owner of this site and see if he has done any X CDI swaps on a R , other than that , maybe Tokyo Mods will have a Programmable Map module that will do what you want , to alter your ignition mapping to suit your needs
If your going to be strictly woods racing , maybe even look for 450X forks , then re-valve and re-spring them (the shocks are basically the same , so just a re-valve will be good enough for the shock) , the R fork tubes themselves are much stiffer than the X , and also different length (slightly), so they don't flex as much , making them feel harsher , as they are made for Moto , where strength is a concern not plushness , so no matter how much you re-valve them compared to the X tubes , the suspension will always be stiffer/harsher
To add to the suspension softness , when installing a skid plate , use a rubber buffer of some sort (old inner tube , etc) to go between the skid plate and the frame , it will do a few things , it will soften the engine vibration going thru the frame by taking away the rigidity added by using a skid plate , it will cut down on vibration noise from the metal to metal contact (if your using a metal skid plate), and it will allow the frame to flex a little more so the bike will feel plusher , due to the skid plate not being in direct contact with the frame which would cause the frame cradle to be stiffer (make sense ?)
Anyway , hope that helps some or at least gave you some other things to consider