Due to my low WPF i use a short sword as a side sword. When i get dismounted i pull that out and fight with it, its got 103 speed and is cheap. IF isnt going to help you much, 1h cav is purely about power. Its alot harder to play than lancer cav and is weak against other cavalry, but with my mighty morning star and its 41 pierce damage i do alot more damage than even a couched lance, but then again the shorter the weapon is and the slower it is the harder it is to use, so start out with a 1h weapon. Maybe move up to that when/if you get good enough. If you hit somone and dont kill them your not going to get another chance, killing someone who knows your coming is hard to do unless your fairly good so power is important.
You could lose your 5 athletics and 5 WM and throw some of it at STR to get another power strike, spend the rest on IF if youve got no where else to put it. You dont need athletics or WM, i have no athletics and can fight on foot just fine. Also about swords, cut damage really is just crap, and if you hit someone with alot of armor even if you have 10 PS its not going to do much, unless you just wanna kill archers i wouldn't use a sword, or atleast use a longsword. Also 1h cav is hard at first you gota stick with it if you actually wanna do 1h cav. If your using a 1h it doesnt matter if you cant thrust, when fighting other cav you should t bone them and spam the shit out of them they got a lance they cant hit you back.