I think we just see it differently ... I'm not really sure RJ had this clearly mapped out. Especially since it seems like there weren't even side notes on the subject
Well, okay, but I don't see any viable alternative explanation. If you seriously think a buffer-less sa'angreal can allow for unlimited magnification of the OP, Callandor and Vora's wand are obviously more powerful than the CK, which means Lanfear was wrong about Callandor, as are the Glossaries, the BWB, and the Companion!
But it's the only logical conclusion when we consider angreal as a "pool of additive power" ... for me it's easier to understand how a magnifier model could create burnout levels of power when a buffer is missing because there is essentially no cap on access to the power here. Compared to an additive model it just doesn't make sense to me that a lack of a buffer allows access to additional power beyond what the angreal was designed for.