I did mention that already, I'm using new sch 80 PVC pipe brand new and threaded it myself, no restrictions.
I saw that you had used Sch80 PVC and assumed that it was new. Nevertheless, unless you physically verified that it was completely unobstructed before installing it, then you just don't know. Even a new length of pipe can have an obstruction in it. Perhaps a mouse crawled inside the 20' pipe to die and is now firmly lodged in the elbow. Who knows?
Based on your observations and descriptions, the most likely problem appears to be a flow obstruction, either at the pump's intake, or in the well system's discharge. Given that you've had this problem with two separate pumps, that your flow rate is always low even when the well column is full, and that the flow rate did not change when you raised the pump 5', my conclusion is that you have a problem in your discharge piping. I'll wager that if you pull the pump as-is and run it in a water-filled garbage can, you will see the same low flow. After that, take off the discharge piping and try running the pump alone. I bet you'll be showered with water from the geyser that will be shooting out the top.
There is absolutely nothing magical about a submersible pump that would prevent it from pumping water from a shallow well. As I said, I have been working on two shallow wells that both have 1/2HP 10GPM FloTec pumps and they both pump high volumes of water, no matter the level of the water inside the well. The static water level in these wells is ~8-10 feet, but they are low yield so they pump dry very quickly when the throttling valve is set wide-open. No matter what the water level is in the well, they pump furiously all the way down until the pump draws air (at which point the Pumptec motor protection controller shuts it off). Your current pump is
oversized for your application. Not only will it be operating way outside it's pump curves (leading to its premature failure), but you'll be wasting your electricity as well. Your supplier should have asked you about your application and should never have sold you that pump. The 3/4HP pump you're looking at on Ebay is also oversized. Craigpump doesn't seem to think too highly of the quality of FloTec pumps, but the two I've been working with have been fine (one has been in service now over 4 years and is still running strong). I would return what you have now and get another 1/2HP FloTec. (I would get their model 2212 pump which is 230V since you have that power available. A 230V motor will draw half the current as a 115V motor. Less current equals less motor heating from internal resistance.)
Speaking of power, that is the only other possible source of your problems. You have not yet described the electrical system (from circuit breaker to pump). Have you verified the voltage at the well head
while the pump is running? It's not enough to check the voltage while the pump is off because that does not give you voltage drop information. Voltage drop can occur if you have a point of high-resistance in your wiring (like a bad connection). When the pump is off, there is no current flow through the wiring, so the voltage will read normal as long as there is a continuous electrical path back to the source. But once the pump draws current, if there is a point of high-resistance in the wiring, the voltage will drop across that point which means the pump will not get the rated voltage that it needs to operate properly.
Btw, motors are not simple resistance loads (like old filament incandescent light bulbs). They are designed to operate at a specific rated voltage (except for universal motors which doesn't apply here). I'm surprised that your 230V motor is still operating at 115V. Have you confirmed the voltage rating on the nameplate which is on the motor (not what's printed on the packaging)? When you run a motor well below its rated voltage, it draws more current to compensate. At 1/2 the voltage, it will draw twice the current. The fact that your motor is submerged in water and only being run for short times (plus the possibility that your discharge is obstructed which will reduce the load on the pump) is probably what's saving you from burning out that motor. But you're pushing your luck.