It's not important to have flat cuts just make sure the front notch is pointing in the right direction, when bored you can play around with angles and swinging trees with cunning cuts but in the end they all fall one way, my favorites are 10 tree + drives, all set up then let em' go, the easiest way by far to drop along a fenceline or road, if they're too close to the fence then bad luck, no shagging round with hammers and wedges if you do it right, of course the safety nazis are wringin' their pasty hands, but hey , if people insist on living in flash expensive houses next to big trees thems the risks he-he, my other favorites are 10 tree+ pile ups, they go off like dynamite, just stay clear and you're sweet, somethins' gotta go in the end, so don't worry about the crooked cuts too much