Sounds good

I'm not sure you have this, attached all the vanilla leaders personalities
I base most of my changes on this, it's very helpful...
I'm just curious, what are the most important stats in your opinion? And do you change the diplomacy modifiers too (contactrands, contactdelays, memorydecays, and memoryattitudepercents), or just leave them as they are in your base leader's personality?
To me, the most important stats are wonder construction, the war ratios, build unit prob, and flavors.
I almost never change memorydecay and contact delays save for if it's something the leader in question was known for.
Also, a really neat line most modders don't seem to use, but is incredibly useful for some of our... hrm... more crazy/egomaniacal leaders?
iBaseAttackOddsChange. Only two base civ leaders have a stat beyond default (Ragnar and Napoleon). Basically, it causes the leader to see the wrong odds, leading to them attacking forces (only sometimes) that are more powerful than they can handle.
It adds a lot of realism to leaders that were too... dumb, I guess you can say, to really know when their plate was full (Hitler) or too prideful (many, many Egyptian and Roman leaders would fall into this.)
Also a tip: I strongly recommend going for extremes on most lines, except for wonder construct and unit build prob. Only do it if the leader -really-, -really- fits it (Good luck getting Sitting Bull to be a vassal). Also, don't set raze city above 0 unless it's -extremely- fitting (the only vanilla leaders I'd say even fit it are Ragnar and Genghis, for example.) This is because it... does seriously screw over the AI to raze cities, most of the time, so you really don't want many that have a chance to do it.
Even then, don't go above 25 (except maybe Hitler and Genghis. I mean come on, Genghis basically erased an enemy from history. It's due partially to him later leaders severely valued NOT SCREWING WITH MESSENGERS.)
Don't forget UnitAIWeightModifiers either. I notice most custom leader personalities don't change that from what they've copied from originally. It's easy to forget, but it does have a -huge- impact on playstyle. It's the reason why Sitting Bull spams archers, why Pacal has more workers than any man, etc.