hi, I made my own driver to drive up to a 2" well by taking a 36" length of steel hollow heavy wall pipe with 1/2" wall, welding a 6" round plug in the end with an eye bolt at the top, and a solid 1" T-bar that I add weight to for driving purposes. My results were similar for yours in driving through clay but in sand and gravel much better. If you are driving in sand then maybe you could "wash" or "jet" the pipe into the earth? I am not a pro, quite cheap and wanted to spend the least I could in putting down a well to water my lawn. I used a tall A frame I borrowed with block and tackle to hammer it in. Lot of work with minimal results, considering 1 1/4" galvanized pipe with 2' point does not produce much water! I am too tired now to drive another but will eventually (did I mention I procrastinate a lot too?)
I think Speedbump stole my design though!! LOL