I didnt read all posts but a couple things important dor working pir sensors with esp8266.
1- esp wifi performance and stability can be affected with pir sensors. It means you can read long ping times and poor performance on esp if you put pir and esp side by side. It need to some space between esp and pir.
2- most pir sensors has 2 mode for output ( repeat trigger or single trigger ) code can be change between modes
3- output on pir sensor important. It must be 3.3v or you can damage esp8266