From my experience PH issues aren't really becoming apparent unless you do something significantly wrong.
The soil usually handles PH swings pretty well.
With that being said, I have no real xp with coco or any mix of both.
Optimal PH should be around ~5.5-5.8 for coco and ~6.2-6.5 for soil roughly.
If you're at 7.2 actually you could try a more acidic watering without any nutes and see the development.
Also: I'm with Nutty here, keep it simple!
Question is: Are you be able to control a mix better it to reap ONLY the benefits? This would require specific tests and documentation in my opinion.
So I'm not a fan of the 2 pills must be better than one logic here for that reason.
But, hey GL with it and if you stumble upon a holy grail -> I'm deffo interested in hearing about it.
Cheers.