I can tell you from experience from my inadvertent IMC, that about 90 seconds in the cloud you cannot tell what the glider is doing, and if I had responded to what I felt I would have tucked in tight and ripped the wings off.

I had practiced the benign spiral (full spoilers, hands and feet off) in my 1-26 and knew if would work from different entry speeds, different banks, ....

I watched the airspeed and the moving map.

At 90 seconds everything in my body told me I had just gone over the top, but the airspeed and the map said otherwise.

Every glider is different and you must practice in your glider and know what it will do or not do.
Some benign spiral well, some spin well, some spin a few spins than go into a spiral dive.

Kevin