I just released an updated version that may work for you. It's version 0.1.8 and adds the newer marlin bilinear and catmull rom expansion. I didn't write the code for this update, but based on what you have shown there it might work for you after enabling the Bilinear option in settings after updating.
I just had to revert an update that has taken some time away from getting the a30 working for you. Sorry, I do this after hours during free time, sorry I haven't gotten to fix it for you yet.
If I just want to view the last previously done leveling is it correct to just have M420 V in the GCODE commands text box?
Secondly, if I run a G29 automatically before each print, is that automatically saved to EEPROM or just used for that print and lost with powering off the printer?
All of these questions are very firmware specific. For me on Marlin 1.1.9 with Unified Bed Leveling I can run the command G29 T and it will report the results of the mesh currently loaded, either from EEPROM after a fresh boot or from after running a leveling process and loaded into memory but not stored.
I see something isn't getting interpreted correctly. The stored mesh data has multiple 0 rows and it's causing something to get off in the graphing. Please type the command G29 T again and post the complete response from beginning to ending ok in the terminal, preferably as a txt file attachment.
Edit. I just noticed that taking the photo above on my iPad moves the zero down from the line above. On a normal browser the rows are
0, 100, 200, 300, 400
Hi.
firs of all i wanted to thank you for your hard word,
second i would like to add that
yesterday i installed bltouch on cr10 mini with the latest th3d unified firmware and i'm still running a nightly build of octopi 0.17 on a pi4 and i kept getting this same error
the only thing i could find in the log was that there was an ! before the plugin in the list of loaded pluging, i power cycled the machine couple times but nothing changed.
I have installed the PlugIn and when i start the codes G28 and G29T i get atached matrix:
Shouldnt it work with this kind of data? I only get the mesh timeout error.
Yes, I believe that format is accounted for. Increase the timeout in settings to give it enough time to complete the probing procedure, which is what I am assuming is happening to you.
Can't wait for it 
