Removing downGrade system at wave mode

Iam Bored of that,each time time i try to upgrade my blaster +5 it gets down to 4
W A V E Mode isnt fair at all for Gp when enhancing +5,I had 5 class stabilzers and enhanced with ( Blaster-gold and i had ( Greatly increased chance but lost :(
Is there any possible to remove downgrade system +5?

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