Low output well and high electric bill
Wow you need more help than we can provide IMO.
First you need your well log to see what the wells should be capable of.
With the lift you have I have normally had much larger pumps but your well log should show what the flow rate is after 3 hours of draw down and
what the water level is at static.
Then you may need a cycle timer to work in series with your pressure switch and the big pump.
With it pumping “dry” for long periods with that lift it will wear the pump heads out.  Cycling will allow the well to recover cool things and cycle and draw down again. you may find that is much more efficient.
How old is the deep pump? Consider it may be worn out. 400’ lift followed by several hundred more ? The pumping chart I looked at topped out at 500’
I did set up a deep well with a large tank at the well head then another pump in that tank to another all interlocked so no tanks over flowed, this allowed the use of much smaller pumps and provided improved performance.
If your 1-1/2 hp is pumping it will be drawing up to 10 amps all the time at a 3/4 gpm flow if you could let the pump rest for 30 minutes then pump for 10 you can see your flow rate should increase for those 10 minutes up to 6 gpm at the pump I looked at and your energy usage will be cut drastically.
10 amps x 240 volts = 2400w  that’s 2.4 kWh every hour x 24 hours per day 57kwh per day , x 30 or 1700 kWh per month rounded down what do you pay for power? Even 10 cents is 170$ per month just for that 1 pump so a cycle timer could pay off in a week or 2.