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Well let me show my inexperience and ignorance....What's a Kafer Wye?
Kafer Wye - Is a Cast Iron wye,(only seen it in 4" & 4x3") in where the bell part of the "top" of the fitting... unscrews so you can install it in the main somewhere. Once you got the fitting in place, you screw the bell back on, and you pack and pour a joint like you normally would. Imagine a 4" cast iron main, and you have to install a 4" Wye...you can't do it without mission couplings. A Kafer Wye eliminates one unless you are putting the spigot end into another bell. Awesome fitting to use.
How did them adding an extra layer of subfloor make your pipe too long? Seems if the floor rises the pipe would be closer to the floor and that extra layer would have helped you.
I made the mistake of adding my pipe on the top side+the bottom side+the pipe through the subfloor. BUT I didn't look at the subfloor. So that left me not adding for the extra that was there "in the wood" if you know what I mean. And I had the extra room underneath this time. Just wasn't thinking all the way around on my part.