I would always have powerstrike over ironflesh in a shield build. Would this not be better:
Level: 30
Strength: 18
Agility: 21
Power Strike: 4
Shield: 5
Athletics: 7
Weapon Master: 7
One Handed: 165
Or you could try - 15/21
Level: 30
Strength: 15
Agility: 21
Ironflesh: 5
Power Strike: 5
Shield: 5
Athletics: 7
Weapon Master: 7
One Handed: 165
Another variation of this build would be to take 2 points from Ironflesh and put them into Shield, you'd have slightly less HP but your shield would be stronger.
I would also recommend using a blunt or pierce damage weapon instead of a cut damage weapon with a low strength/powerstrike build :D
A nice build for thrusting one-handed swords is the Matey_BRD build.
12 STR / 24 AGI
1 IF
4 PS
8 SHD, ATH, WM
172 1h WPF
The nice thing about this build is that if you hit level 31 and decide not to retire you can max out your ironflesh and go from there.
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Also, if you prioritize speed and maneuverability over defence, another option is to copy my build.
Level 30: 12 STR / 27 AGI
4 PS
9 ATH, WM
180 1h WPF
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Level 35: 12 STR / 33 AGI
4 PS
11 ATH, WM
One leftover skill point
200 1h WPF
The thing I really like about my build (which I'm still working on, by the way) is that all of the extra shield weight that most one-handers have to put up with isn't there for me. Carrying only a short, light one-hander and light armor with high athletics turns you into a rocket.
In my opinion high WM does not pay off.
Here's my Mr_Turtle build:
Level 32: 12 STR / 33 AGI
4 PS
11 ATH,
1 WM
1 IF
120 1h WPF
The real question is, where are you going to put that one spare point of wpf?
Also, how far are you along now?
Still quite a ways off. I want to max out my gen exp bonus first, so I have to finish this gen and then I'll get into it. Also, I'm going to do a 12/27 swashbuckler this gen (so far only level 19, gen 15) to get a hang of it and fill out any flaws I find for the final product based on my experience with it, but it should be fine given the amount of time I've put into my STF for that build.
In my opinion high WM does not pay off.
Here's my Mr_Turtle build:
Level 32: 12 STR / 33 AGI
4 PS
11 ATH,
1 WM
1 IF
120 1h WPF
It pays off if you're an agility build or have already gotten a fair amount of power strike.
The damage multiplier formula is (1 + 0.08PS)(0.85 + 0.0015WPF)
With 4 PS and my planned 200 WPF I'll have a damage multiplier of 1.518.
If I sacrifice as much WM as I need to push my PS to 5 I'll end up with 144 WPF with 4 WM. That gives a damage multiplier of 1.4924.
Unless I'm somehow misinformed or there have been heavy changes since I last looked into it high WM *is* worth it, at least if you're already going for an agility build.
Source for damage multiplier formula: http://forums.taleworlds.com/index.php/topic,168722.msg4090900.html#msg4090900
Granted, I could drop WM entirely and push ATH even further for more speed bonus, but at 11 ATH I think I'll already be fast enough, especially in light armor with a one-hander.