First off, I would like to commend you for your detailed question.
Sounds like you are taking the steps to properly establish your intentions and domicile.
A vacation home being maintained does not establish residency.
The more time that elapses after you move to a new state and the more steps you take to establish domicile in that state, the harder it will be for your old state to claim that you’re still a resident for tax purposes.
I would suggest keeping a record of your locations and dates for review at the end of the tax year. If you do not establish permanent residence, get state level identification, or make other major moves towards establishing a permanent residence you will likely not owe income tax in a state due solely to a short term visit.
If you ever receive a letter from the CA FTB, you would simply want to use copies of the many documenting factors of residency in TX you listed to prove your status.
I hope this helps!
-Dennis
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