Bad Maths
You suggest that you can get 1.6th g for 150 seconds vs 0 g for 25 sec (150 = 6 * 25).
Wrong.
(if you were right, you could get 1/10 g for 250 sec, 1/100 g for 2500 sec, 1/1000 g for 25000 sec and 1/10000000000000000 g almost forever)
As Douglas Adams says, "This, of course, is impossible".
In this case it *IS* impossible.
1/6 g takes a parabola that is 83% of the curvature of a zero g parabola (1 - 1/6).
So you get 31 seconds at 1/6 g vs 25 seconds at 0 g, and the transition of gravities makes you vomit, anyway, not the magnitude of the minimum...