The problem is with your protool.
A 1 inch impact wrench that only outputs 280 is completely wrong. 1 inch electric impacts get around 1000 Newton's.
280 is what a small compact cordless 1/2" gets.
Somewhere that print on your protool is wrong
Correct tool: high torque angle drill. Makita X2, flexvolt, holehawg.
Convenience tool but don't cry if it dies prematurely: any heavy duty drill from any manufacturer