When you "identify" youre items your in essence changing their "flag" setting. Which is why its changing the values. Create them as Ancient and be done with it.
Not to be the bearer of bad news but the weapon you speak of is quite useless. The game caps you at 5 attacks per second so while adding attack speed to the weapon makes your stats sheet look better, its artificially inflated. But if you want to create it. It probably had a modded gem of ease which will allow an additional 7 affixes. So that's 6 on the weapon (1 is sockets) + 7 on the legendary gem +2 regular modded gems. = 15 lines of affixes to play with. Look for my previous post about high damage weapons to get the full math explanation of how Diablo actually calculates damage.
Not to be the bearer of bad news but the weapon you speak of is quite useless. The game caps you at 5 attacks per second so while adding attack speed to the weapon makes your stats sheet look better, its artificially inflated. But if you want to create it. It probably had a modded gem of ease which will allow an additional 7 affixes. So that's 6 on the weapon (1 is sockets) + 7 on the legendary gem +2 regular modded gems. = 15 lines of affixes to play with. Look for my previous post about high damage weapons to get the full math explanation of how Diablo actually calculates damage.