I have never done a foot thrower build, but I made this dude as a STF kind of gimmick test character:
* Strength: 21
* Agility: 12
* Hit points: 70
* Attributes to skills: 2
* Ironflesh: 7
* Power Strike: 7
* Shield: 0
* Athletics: 4
* Riding: 4
* Horse Archery: 2
* Power Throw: 7
* Weapon Master: 4
* One Handed: 95
* Throwing: 115
And I'm having a real blast with it. On horse I take 3 throwing spears(so you get 4 per stack), and usually the cleaver 1h for 35 cut. Very excellent for taking out enemy horses once you get used to throwing on a horse. Because of the slow speed of the missile in flight I usually harass lancers with my 1h out, kind of act like an idiot if I can't kill them, then once they start chasing me switch to throwing and down their horse. Kills most unarmored in 3-4 spears.
Throwing can be used vs dudes with pikes if they are slow and lazy, or try and sit up on a little piece of terrain. It also functions as a perfectly viable 1h horse too, 4 riding isn't great but I actually find slower speed to be useful in making people over shoot me with slow maneuvering.
With 4 athletics on foot, if you take light armor you can still be plenty quick. And the Ironflesh could be converted to anything if you want. You're not going to rack up mega kills every round(although you can't really do this with any throwing), but you will kill a shitload of cav's horses and really piss them off. Hell you can even kill some HA now because of their brutal accuracy nerf.
MAJOR TIP NO MATER WHAT THROWING BUILD YOU USE:Turn off auto repair. You have to as a thrower. If you take 3 slots of the same throwing item and it breaks with auto repair on, you get a repair bill 3x. If you let it break, then fix it on the website you only pay once. Now this *might* lead you to play a round or 2 with a -1 damaged throwing weapon but it only drops the damage by like 3.