I don't sell Goulds, but I believe you have a 3/4hp and the pump is around a 5gpm model for the depth of the well. It is a low yield well and subject to being over pumped in high water use times.
If you find the pump is not at the bottom of the well, you may want to have the installer put it as close as feasible to the bottom. I would also recommend the Subgard to protect the pump and the Pumptec which will turn the motor off quicker than the thermal overload in the motor does.
I would definitely replace the pump after 15 years. Your on borrowed time as it is.