Sounds to me like alignment is off. Sounds like two much toe in which will make it twitchy . Your alignment shop said they didnt know it was leveled . It should not of made a difference in aligning it as it is the same specs as stock in most cases. Its just a little more time consuming as it " WILL " need caster, camber and toe in all adjusted . Too many shops now days think setting toe alone is an alignment its not its a combination of all three . They use the fact you lifted it as an excuse to charge more and it shouldn't be. I think after hearing his excuse I would go to a different shop