Dave.
Replace your friction and steel plates at the same time. What will happen with a steel plate is they will get a hot spot on them, and will never operate properly. If they get excessively hot, they can also warp.
Hot spots cause the friction plates NOT to engage properly on the hot spot.
I again want to mention that to the best of my knowledge B&M DO NOT manufacture steel plates, or friction plates. They may come in a B&M package or kit, but they will have been manufactured by one of the three clutch plate makers in the U.S.A., (unless of course they are outsourcing, ie Asian off shore) their plates. If you let me know if it is the front or rear clutch pack you are having a problem with, I'll get you the correct clutch and steel thickness and what you should have for clearances in that cluch pack when you've assembled it.
After all my years of experience in the transmission industry, I've come to the conclusion that a partial or cheap rebuild will end up costing you more in the long run than doing a thorough job to begin with.
transman