ok where do I start. Not trying to be mean here, but trying to help. Please understand that.
1. you are swinging way too incredibly fast. You are gonna be missing targets all the time swinging like that. SLOW way down.
2. when you cut a plug, please replace all the dirt back in the hole, leaving it all over is messy and gives other people who detect a bad name. U should not leave any trace someone was digging there. Try to be as neat as possible.
3. When you get those jumpy signals, don't just quickly pinpoint and dig, turn 45 degrees and sweep over it again, then turn a lil more and sweep again. That will rule out a LOT of junk signals for u. A lot of times you will not get a good signal when you turn and it will save u time digging trash, deep iron etc...
4. when you pinpoint, first center your target left to right, then once you have that, slowly drag your coil back till circle is almost complete but not quite, then go forward just a hair till circle is full again, target will be exactly in center of coil. You pinpoint so fast, just like your swing, so it down, no hurry.
5. get your a pinpointer it will speed up your target retreival 10 fold, imagine if you dug a nice key date silver coin and you pounded your digger thru the pile of dirt trying to find it and gouged it.