G'day Ryan.
Don't quit trying to warn people if you think there's a problem.
By the same token when people give you some feedback put aside the stuff that's a bit harsh and have a good look at what their experience may be offering.
Don't blame others for your mistakes. The caretaker isn't to blame for you not having the take off performance, but yes it's right to warn others about your experience and that the grass is long at the moment. Licensed airfields are suffering the same problem here in nsw at the moment with a a wet Period and grass growing too quick while tractors can't get there to slash.
Unlicensed airfields are not really CASA's responsibility and either way it's always the pilots responsibility to assess conditions and performance.
While it may seem harsh (and some comments are harsh) to have this pointed out, there's no arrogance or agenda, it's the way it is. You're the captain of that aircraft. You've had a bad day. Warn others, but take responsibility.
Cheers