Sorry for not answering you back earlier. I am quite busy at the moment working on my PhD thesis xd
A few remarks (from my own experience):
- I checked your code and build log a few weeks back and everything seemed OK.
- With these small molex antennas I found that they work even without tuning caps.
- (And most important in your case as I remember) I struggled QUITE A LOT reading the tags with iPhone devices (in fact, I don’t recall being able to reaching them at all, some weird internal settings IDK).
If you have the chance, try reading it with any NFC-enabled Arduino smartphone as my own is able to read them easily just while unlocked without even opening any NFC-reading app whatsoever.
Hope I helped! 