I agree with BB, it depends on personal preference for feel and ability. It seems a little odd to me to use an eastern forehand and western backhand, but whatever works. I hit full western on both sides and start with racket in roughly continental grip with right hand, which essentially puts it into backhand grip and I also follow my racket back with my left hand for forehand which allows me to easily and efficiently change grips for forehand return. If I am feeling aggressive I will just start with western forehand grip and look to rip a forehand, and if I get a backhand I can just hit a heavy topspin one-hander. The grip on return of serve is rather underestimated and too little thought given to it. You kind of need to practice a lot and figure out a way you can quickly and easily get to the grip you need and still be able to hit a good shot. But, again, your two widely varying grips may cause a slight issue with that. I often use your same strategy for waiting for a forehand and slice a backhand if it comes, so I may suggest working on a more penetrating backhand that you can hit low and deep. This would solve your dilemma. Hope this has helped at least a little...