Shrinking vector

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GfK

You're modifying Vector_X then applying that change to Vector_Y. Try this (ensures you're working with values which are constant throughout the 'science bit' ;) :

vx# = vector_x
vy# = vector_y
vector_x = (vx * Cos(ang)) - (vy * Sin(ang))
vector_y = (vy * Cos(ang)) + (vx * Sin(ang))