I am currently sitting at around 275-280, I still train heavy in the martial arts, but the secret is periodization. For Example if you look up my recent posts, you will see that I am on a Bench press specialization program right now. So with that in mind I have cut down my kickboxing/grappling program to a maintainance phase. I train two maybe three times a week and very light focus mitt work, light rolling just to keep my technique in check. Once I am satisified with my strength level, and I am ready to lean out a bit although maintain my strength, I hit up my fight training 5 days a week, and I drop my weight workouts to Full Body HEavy Weight Low Volume on mondays (HIT style), and depending on my personal recovery I may throw another lower intensity workout in somewhere between thurs and Friday). During phases like this you are doing so much cardio that it your NUTRITION/CALORIE INTAKE MUST BE MODIFIED TO FACILITATE RECOVERY ACCORDINGLY.
ALSO YOUR CHEMICAL ENHANCMENT PROGRAM NEEDS TO BE MODIFIED AS YOU MOVE FROM PHASE TO PHASE. BUT THE NUTRITION AND REST ASPECT IS PRORITY NUMERO UNO, THAT MEANS NO LATE NIGHT PARTYING AND RECREATIONAL DRUG USE, AND VERY VERY LIMITED USE OF ALCOHOL.
IF you are interested in a more specific explanation feel free to pm me.
By the way I cut down to around 255 for my fighting weight, sometimes as low as 245.