Considering the damage difference between spear and sword, I'd chose different hybrid levels for them as well.
For spear: 80-85%
For sword: 85-90%
Personally I tend to go on the higher end of those numbers to get better damage. I compensate with good equipment and smart fighting to enhance my survivability. I usually don't lose pvp fights unless it is against SUN (which I can't afford), STR/warlock or 2H/cleric builds, so I must be doing something right.
