By about 0 percent lol. That's taking into account the +15 HP/man.
I thought you commited ritual sucide after getting schooled on how flamers were ballistic weapons?
On to the case.
Thompsons for instance will be less effetive at shooting moving FSJ with airborne armor, by 25%. Considering how thompsons already are poor at moving combat this will mean a great deal for FSJ being chased by thompsons.
Sniper rifles. The american sniper rill now have a 25% chance of missing the FSJ when they are moving.
However - tommy brens will be better against FSJ, but not by much. Regular M1 garand rifles will be worse against moving FSJ.
Overall its not a huge improvement. But it allows for more hit'n run type of attacks with your fallschirmjager tankbusters and your riflegrenade FSJ.
It might be useful, its hard to say. I'm getting this.