while i have your ear, and pursuant to a conversation across several other threads now, would you say that larger diameter supercardshypercards (mk41, 4018, ak50, etc) have less of a problem with proximity effect than smaller diameter microphones (4098,4099, at853, etc).
As far as I'm aware, proximity effect correlates with how much bi-directional component there is in the pickup pattern, not diaphragm or housing size. The closer to figure-8 the pattern is, the more bass-boost will occur from proximity effect at close mic-ling distances. Perhaps DSatz may clarify for us, as he has far deeper knowledge on these things.
Of the supercards I have on hand, I don't detect more proximity effect in the DPA 4098 than the Gefell M210. I can't recall testing the proximity effect of the supercardioid pattern on the large diaphragm ADK TLs I have, but I expect they would fall in line similarly.
What is most influential is the intended use of the microphone, as the microphone's frequency response is tailored for achieving a particular response at a mic'ing distance typical of that intended use, taking proximity effect into account. If the microphone is intended for producing a flat low-frequency output when used for close instrument or vocal mic'ing (ignoring the common midrange contouring of vocal mics), the native response of the microphone will be tailored so as to attenuate the lower frequencies which are boosted by proximity effect when the microphone is placed close to the source, with the overall end result being a flat response. That same microphone will have attenuated low frequency content for the pickup of any sources located farther away.
By contrast, a microphone intended to have a flat response at greater mic'ing distances will have a native response with increased low frequency response, such that when used up close it will sound very bass-heavy, but when used at the intended distance it will produce the intended response, and when used farther away than that it will have reduced bass response, if not nearly as much as the previous microphone.
In other words, proximity effect is an aspect of directional microphone patterns and bass response for most directional mics will vary with mi'cing distance due to it. Most the variation occurs in close proximity to the microphone. In the significantly more distant range from which we are taping music it's not really varying dramatically anymore, and may either be compensated for via the native response of the microphone, via EQ boost afterwards, or via mixing in another source with increased low-frequency content such as a pair of omnis.
An interesting exception is EV's variable-D technology which reduces proximity effect variation at close-mic'ing distances. It strikes me as perhaps being a cousin to the principle behind interference tube microphones, yet with the multiple tuned path port lengths used on the rear vent entry side of the capsule rather than the front as in a shotgun mic.
EV variable-D
https://youtu.be/0MDxZ2LDANA