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You are right and i have not thought about that.
I had no problems with that to today, lets find out why.
I have got out my old book from school.
The rod has a lenght of 350 mm.
And the temperature is going up from 20°C to 50°C .
And Ferrum fe has a Temperaturausdehnungskoeffizient of 0,000012 % per degree.
350 mm x 0,00012 x 30°C = 0,126 mm
I don't think the constuction of the A8 ist that stiff that it can't handle that 0,126 mm.
Disregarded the fact that the acrylic frame does also change the lenght with temperature, not as much as the rod.

If you use flexible coupler the coupler will get pressed down with the weight of the extruder, if the extruder is left the left rod will go down because of the weight and same for the other side. But i can't say how much. Then you will get a convex surface on your part.