Yes they did rotate 90 degrees for under ice penetration. But that system is a hydraulic cylinder on the control rod. If the planes were set at 0 (normal proceedure was to lock them at zero in preparation to surface under ice) the planes got to 90 when the cylinder is activated.
If the planes are at 2 degrees up, the planes go to 92 degrees when the cylinder is activated. Kind of an on/off thing. But, as I remember, there were interlocks that prevented the system from being activated if the planes weren't on zero. And to prevent the planes from moving while the under ice system is active.
I don't suffer from ulcers, I'm a carrier.