Well,take into account my last jutsu doesn't take hand seals at all so the wind and spikes are created almsot at the same time

Following that time frame,you'd still get skewered by the spikes.
Note I was also expecting you to do that to defend from my kunais,which in any case,only benefits me since now you are surrounded by my kunais,i can use FTG to finish this battle in an instant O_O
Well,for the question,I'd never threw a kunai alone.I throw two kunais,one hidden in the shadow of the first one.Logically,the one thats not hidden clashes with yours,they fly into different directions and now you have even less time to react for the second kunai thats coming at you,i then use FTG to grab my first kunai which is still in mid air and upon doing so,i throw again two kunais,the one i just grabbed and another one in the shadow.
You will eventually fail to defend due to lack of time O_O