Did you remove the roof spoiler and replaced it with the original Type R vortex generators? The original roof spoiler will bring problems if you put a Type R spoiler on the hatch.
Our AC was failing too..... 2018 Civic with 55000km.
System was completely empty, hopefully there is no damage to the compressor.
They changed the condenser and some other parts and refilled the system.
For now the AC is working...
Sorry to hear about those problems, thank god i found my 1.6 iDTec... yes it needs an oil change every 8000-10000km, but it runs like a charm.
I was about to buy one of those 1.0T, but i didn't trusted that small engine, especially when i found out that they have a timing belt running in oil...
I think i solved the problem on my 2018 Civic Hatchback, i had the same issue with massive hood flexing, while driving >100km/h.
Directly behind the headlights are adjustment knobs (sorry for my bad english).
I turned them a bit higher, so the hood will lay on them when closed.
Test drive >...
Another one from germany ;).
We got our first windshield replaced in october 2019.....
A very small stone hits our windshield right in the centre and instantly a 10" crack appeared....
This glass is so fragile.
Interesting.... don't find anything but the H&R springs for my 1.6 DTec Hatch.
Found more for the 1.5 Sport:
https://www.sportfahrwerk-billiger.de/Honda/Civic-10-Schr%C3%A4gheck-FC/1,5l-VTEC-134kW-182-PS/Tieferlegungsfedern/Alle-Hersteller-m21908-c3-Alle.html