Whole, Porfyry, Alcabitius... - Discussions, questions

Hello everyone,
In my struggle to understand and study the three classical major bodies: Hyleg, Alcocoden, and Almuten, I´ve encountered a problem that I can´t think of or decide how to go around. So, I´m asking this for guidance if possible from people who worked with the classics.

My problem is that, I´ve always used the Whole Sign system (for both, Hellenistic, and Vedic of course) and when I started reading about the 3 points mentioned above, I initially worked and examined my chart in Whole Sign. However, it turned out that there might be a critical difference in the final result once I change the house system. I read in some texts that Dorotheus and Ptolemy could have used Porfyry specifically (though it is debatable it seems in the case of Ptolemy). Meanwhile, Al-Qabisi (Alcabitius) who is another classical resource for discussing such points, most probably used Alcabitius house system. Visually, Porfyry and Alcabitius on my chart are quite close, but the main issue here is that some planets (mainly my sun) is less than 5 degrees away from the cusp of 3rd house in both systems and that changes the whole consideration for the sun to be a hyleg for example (because in such systems it would be considered in 3rd house even though by calculation it is in the 2nd, and that makes it in cadent, and hence can´t be hyleg). Such rules are not there as far as I remember in whole sign system and when I follow the instructions of, for example, Al-Qabisi, my sun would be well suited for being a hyleg; But not when I use Alcabitius house system.

So between these options, I´m in a dilemma how to proceed. In fact, I´m not sure which method to use for finding the hyleg but maybe I´m inclined to Al-Qabisi which is quite similar to Dorotheus but with minor changes or extras maybe. Al-Qabisi also is the latest from the three I believe.

Any insight? Much appreciated. Thanks in advance.