How to analyze altitude in different conditions?

Hello, recently made GPS as the primary source of altitude which solved the altitude drop issue. But I had encountered a new problem where there was altitude in auto mode in some cases.
Hence I speculated this could be due to high Vacc value and I changed the value of EK3_GPS_VACC_MAX to 1.4. After this I observed that even during manual flights there was altitude drop. So maybe the altitude source got shifted to Barometer because of high vacc value (>1.4) at a particular instant. But the issue is that even when the vacc value got less than 1.4, the altitude drop was still there suggesting that the altitude source didnt shift back to gps. I have two questions:

  • Am I right in this assumption that the altitude source doesnt shift back to gps when it has shifted to baro due to the conditions met A/C the paarameter EK3_GPS_VACC_MAX.

  • Is there any instance in the log that I can look at to know the reliable data on altitude?

log: 00000039.BIN - Google Drive