As Inma says, sometimes it is quite difficult to draw a 'sharp line' between occasions when we should, and when we should not use the subjunctive.
My grammar book [by Butt & Benjamin] offers a simple and interesting guideline to help decide which would be best in the context of "aunque, referring to present [and also past] events". As is to be expected, expressing something in the subjunctive "strengthens the concession". Thus, they suggest that if you can translate it as "even though ...", then the subjunctive will be more appropriate:
"Even though you don't like films, you will like this one" >
"Aunque no te gusten las películas, ésta te va a gustar".
The Butt & Benjamin "rule" is of course quite consistent here with the concept of "shared information which is known both by the speaker and by the listener".
Butt & Benjamin cite another example [quoting a Peruvian Scholar]:
"I'll never blame Octavia, even though I may have tried to sometimes" >
"Jamás culparé a Octavia, aunque lo haya intentado alguna vez".
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