I do something similar to this. All my cues are radial pins and the shafts are interchangeable. The ring work is the same on all my shafts.
The butts that I own are ALL very different from one another in terms of balance point. They also differ in wrap vs wrapless as my hands tend to sweat and my grip slips in very hot conditions.
I can not control the air condition going out at the pool room. I can not control the room owner changing the cloth to mudd cloth vs. 760 simonis cloth. I can not control if the tournament uses brunswick or diamond tables. I can not control tight pockets vs. sloppy.
I have been desperately trying to narrow my equipment down to one cue! But, i notice that one cue set up works better for one set of conditions and another set up works better for a completely opposite set of conditions. For me, this is the case! If only pool had standardized the equipment and materials??? You are always guessing about fast cloth, short banking rubber cushions, pocket facings, pocket shelfs, Ball composition, table lights. & etc. I would love a little consistency! But, It won't happen in my life time. Pretty hard to compete at the local pool room and major tournaments with them having polar opposite playing conditions!
What ya're doing sounds like Jose Parica, he's known to change different cues in the middle the game, heard that he has many top cuemakers's cue like southwest, diviney or gina.
What you doing makes sense in terms of choosing your cue that is most suitable for the table conditions itself, but here's the problem , you can't possibly practice with every cue can you ??
What i do is use the same shaft every time irregardless of my butt so i'm kinda used to how my shaft plays.
My butt is just dependent on the design i feel like using on the day itself lol.
Just my 2 cents