Hagon Fork Springs

[returning rider]

has anyone fitted Hagon progressive fork springs to their Fazer was thinking once i get it up and running as a i a fat bloke will need to beef up the suspension, Hagon shock for the back looks a good shout the front is nothing special I know so would this make a difference? 
Also read that moving up a thicker oil can help as well?

Is it worth spending the money or save for something more radical like front end swap or new bike?

I like riding position and lots of other things about the Fazer but don't want to throw money at it either if no benefits


cheers