I've modified about on third of HARP weapons to give them a bit character. Small changes like faclhion +5 OB (no effect to damage cap) but -5 Init +1 to Fumble, Sabre -x vs metal armours but +y to init...
Kynack could be +5 OB, small Puncture, medium puncture vs no armour or soft leather...
If you want balance rising something lowers something like +5 to OB vs metal armours +1 to fumble -2 init.
Changing init mod, fumble range, instrict ob and modifying damage cap in certain area gives desired variety to weapons. My players are happyer now than before.
All numbers are pre counted in char sheet so effect to gaming speed is from zero to minimal (in case of varying damage cap or OB variation depending on 'armor type'/ armor material) compared to thinking about combat actions (pover attack fencing slash..)