well, this guy is asking for tricks to lvl up, i think. like try in non-lag times, etc, etc,.
well dude, i'll tell u some rumours about these things. these are rumours and not confirmed, so, i don't take any responsibility for the accuracy of these tips.
try in non-lag maps and non-lag areas of maps(preferrably at mid-night)
make sure no-one is around u when u try, drop the item and the gem u wanna use, pick item n then gem, drop the gem on item.
another rumour is try as fast as u can after u get the sms/sj/lj/lms(let's say the same spot as the boss dropped the gem). some say the boss which dropped the gem also has influence(like 1 rumour about the khainen drops have good success rate)
again these are all rumours and i don't claim these to be my tips and neither do i take responsibility for their accuracy
well, regarding lvling up.
if u want lvl 8, then try LJ at lvl 5, this way , it'll end up at lvl 6 or if lucky lvl 7, try SJ after that.
if u are short on ujs, SJs are best as they have most success rate.
well, lvl 6 is good enough as far as def is concerned as items get good boost from lvl 5 to lvl 6. lvl 7 n lvl 8 are just fancy as items don't get much boost(they are only for show off). lvl 9 and lvl 10 get good boost too, but tough to achieve.
lvl 6 is with added def is a good idea, if u want to lvl up items for def.