USArmyParatrooper, I have been reading your various posts about the Vaquero. I have actually only owned a Vaquero for about 1 month, but I've also owned about 15-20 different detectors the last 20 years I've been detecting. The Vaquero is a little bit different than some other Tesoro machines I agree. It is quite sensitive, but believe me, I can see the potential for good finds with it. I have found it to be very sensitive on gold jewelry and quite good on getting coins at impressive depths.
One thing I've noticed is that all the UMax tesoro models are very sensitive units, and some new users are overwhelmed by this. So, my advice while you are "getting your feet wet" with it, back off the sensitivity level to about 7-8 or even lower according to your preference and put the disc control up a little bit (definitely above iron but below pulltab) and listen for clean, distinct signals for your first few hunts to get comfortable with the machine. This is much easier to do if you have the smaller coil (5.75") on it rather than the 8x9" elliptical stock coil. I don't agree with Tesoro offering this coil by default - I like the concentric coils much better for pinpointing ability and depth. The 8" donut coil is also a good choice. I hear there is also a 7" concentric, but I don't see much difference between 7 and 8 - so I would recommend the 8.
I feel that the elliptical coil is much more susceptible to "false" signals and does not pinpoint nearly as well as a concentric coils - and to be honest, is not the best coil to use until you have some experience with the machine. In my case, I started with the 5.75" coil almost exclusively for the first 3 weeks, and just now I am starting to use the elliptical coil. When I bought my unit used, the guy I bought from was offering both coils as part of the package. I'm really glad he did that. Currently, I'm actually considering trading the 8x9" coil for the 8" donut - I have the ad on the classified forums, but so far there are no takers.
Large iron is a problem with just about all machines - just about all of them would pick up a skillet or larger iron piece with a large signal no matter what the disc setting used was. Smaller iron, though, you will begin to notice the tell-tale "crackly" hits that nails and rusty bottlecaps will produce, and this should help you avoid digging them with the Vaquero. Coins, tabs, rings, and other normal-sized targets should give a distinct, strong response on the Vaq, the exception being deeper dimes, which give a softer hit than most coins, at least in my experience with it. All pennies should hit hard on the Vaq at almost any setting used (even max disc). Rings you will see can pick anywhere from iron (really small, thin rings) to foil (small/medium rings) to pulltab and nickel (medium/large rings) to coin (large/very large rings). I have noticed a good degree of overlap on discriminate points on the Vaquero - for instance, even if you set the disc at nickel doesn't mean that you will never find nickels - a few always seem to hit higher on the scale than they should and will still be found. This effect is more evident for tabs - probably because there are so many varieties of them and they all pick up a little bit different than each other.
Anyway, I'm rambling on here. You have a good machine, and I don't anything is wrong with it. Just take some time and keep using it often, and with experience, your finds and your level of confidence with the Vaquero will improve. I would strongly consider getting the 5.75" coil though, it is very easy to pinpoint with and recover targets with, especially in really junky areas. And it can still get plenty of depth - coins/tabs/rings at 6-7" are no problem with the small coil, but you must have your ground balance set properly to get max depth with this machine. I cannot stress the GB settings enough - they are very important for optimal performance with the Vaquero - the manual explains this process pretty well, but if you get stuck, I can give you some tips on it.
Anyway, I hope these tips help you.
Sincerely,
Mark