1″ spacers only in rear, how much improvement in stability.

Looking to improve the stability of my machine. Don’t want to go wider than 50".
My ’15 Ace has the weaker front struts. So I’m thinking adding a set of 1" to the rear.
Not sure how much more stable the machine will be with it only 2" wider.
Anyone do this or know what I can expect?
Thanks for the opinions.