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The wall of force thing:
1)
Control Winds
Area 40 ft./level radius cylinder 40 ft. high
2)
When casting a cylinder-shaped spell, you select the spell's point of origin. This point is the center of a horizontal circle, and the spell shoots down from the circle, filling a cylinder. A cylinder-shaped spell ignores any obstructions within its area.
3)
Line of Effect: A line of effect is a straight, unblocked path that indicates what a spell can affect. A line of effect is canceled by a solid barrier. It's like line of sight for ranged weapons, except that it's not blocked by fog, darkness, and other factors that limit normal sight.
You must have a clear line of effect to any target that you cast a spell on or to any space in which you wish to create an effect. You must have a clear line of effect to the point of origin of any spell you cast.
A burst, cone, cylinder, or emanation spell affects only an area, creature, or object to which it has line of effect from its origin (a spherical burst's center point, a cone-shaped burst's starting point, a cylinder's circle, or an emanation's point of origin).
So we have 3 things interacting, 1 and 2 seem to say that control wind, being a cylinder, will work even behind the wall of force.
But item 3 clearly states that it don't, as Wall of force block line of effect.
I think that 3) is the more specific rule, so it supersede 2.
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Fortitude save:
Control Winds
Saving Throw Fortitude negates
and
Each round on your turn, a creature in the wind must make a Fortitude save or suffer the effect of being in the windy area. See Environment for more details.
I don't see what there is to argue here. Fortitude negates is clear.
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Wind strength; I agree with you, but the spell text could be interpreted both ways.