If you move the core to the middle after powering off you’ll probably find both sides go down. Some people use blocks to chock it up.
I’d be worried about the stresses caused leaving it like that.
Understood. So I guess most everyone doesn’t power off with it in the home position?
I keep a little stack of 2x4 blocks near the rail and slide them under so the rail parks on it.
I usually just put the blocks somewhere near where the core is and it holds up.
Some will actually park it in a spot where it drives there and lowers in the right position before powering off.
Either way, I just try to not let it drop on its own.
I have the same issue after lubing the Z screws. Now when I park it, I lower the Z to the table before turning it off. But I think I’ll start using 2x4 blocks or 3d print a cradle to put it to bed in.
Which width does your LR have? Are 6 braces enough for it? I have a 1400mm ganty and am using 8 (which might be overkill), but 7 is the recommendation.
It should not change too much, but better to check that. 
I usually leave it in the back so i can use the front for other things.
Idk if 6 are enough. I can’t remember how I got that figure. My gantry is about 1400 or whatever the calculated size for a 1200 work area.
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That should be at least 7 I think. I’d leave it like this though and keep that in mind if it’s not stable enough. Or, since you didn’t cut any strut plates yet, just add a seventh.