Don't double post. Read the below and shoot if you have any questions. Read them thoroughly, I'll know if you didn't.
Fire and Wind creates a bigger, stronger fire.
**When a fire and a wind jutsu of the same rank are shot by two shinobi facing each other, the result won't be a stronger fire jutsu continuing forward, but instead it'll be a weakened fire jutsu (one rank lower then it originally was).
**When a fire jutsu clash with a one rank higher wind jutsu, they will both cancel each other out. If higher then one rank, the wind will overpower the fire. However, there are exceptions; for further details continue the reading.
The way I see the fire and wind clashing is like putting too much air into a flame, it won't do any good. However, when a wind jutsu merge from behind it only add to both jutsus momentum, reinforcing each other. I can't think of a jutsu getting stronger as he clashes with another one and loses speed. I know Fire is the elemental weakness of wind, but we shouldn't see it as fire and fuel. Air is only good for fire in certain proportion, let's not forget that.
After this we shall proceed performing wind techniques