A 1% increase for AS/DS/TD/CS can be significant.
If you're near capped or capped and you swing with 450 AS - 1% of that is 4.5. If truncated you net +4, if not you net +5 to your AS. This is built on a closed system, you know what your thresholds for hitting a target are or for defending are. If you know getting an extra 5 to your TD makes you invulnerable to the creatures you're hunting, you can generally find a way to get that +5 to keep you protected at all times.
A 1% increase for your SMRv2 defense might be beneficial, but at a much lesser amount. SMRv2 is an open roll system. Regardless of how much extra defense you can put towards your SMRv2, you're still going to get fucked with the open rolls. No one is safe from SMR, ever. I found it irritating that my burghal gnome lost 20 to his SMRv2 defense against krag dwellers. It used to take around 80+ roll to him him, under the changes it's now a 60+ roll to him him, yes he is over hunting them right now by a few levels....but that loss of 20 defense is big; even on a low endroll of 104+ he's getting stunned 4+ rounds and left prone. I've been hit by the boulder maneuver 6 times since I started hunting him after about a month break from playing him and I don't hunt him that often, one or two hunts a day.
I suppose the maneuvers would irritate me less if they didn't outright maim and stun for days on lower endrolls, or even kill at times. Perhaps they should be looking into how those low endrolls of 101-105 are lethal (at times) to certain classes or at least those in non-crit padded light armor or robes. I've had boar charges with a 102 endroll do a rank 3 crit on my sorcerer a handful of times....a fucking 102. I can understand getting knocked over, maybe with a small wound with low 1-2 round stun with a roll like that.....but a 102 endroll doing a rank 3 crit to the eye is fucked up. Nothing like passing through a room and instantly dead from a 102 endroll from a boar charge.