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Hmm, I had no problem with AD797 at 20 dB gain when I replaced the LT1082 in my MC phono stage a few years ago. However I've read in Douglas Self "Small signal Audio Design" that early versions of the AD797 were difficult to stabilize and later versions not. Maybe the designer @scott wurcer can comment on this.
There were never any changes to the circuit. One must be careful many phono circuits end up closing the loop at unity gain at high frequencies and gain of 5 stable op-amps will oscillate. I never heard of a customer ever making a claim like the OP37 is not stable below G =100. This would actually be absurd.