The road to find the ultimate driver can be long. These following steps can help you find the best driver for you.
First step is to find out your swing speed with a regular driver (10.5degrees with regular flex shaft)
Swingspeed 50mph-85mph = soft flex Swingspeed 86-95mph = Regular flex Swingspeed 96-105mph= Stiff flex Swingspeed 106-115 mph XStiff
There are two different swing types: Hard hitter swing and the swinger swing. The harder hitter got to look for stiffer shaft than other swing type! Often the shaft twist easier also.
The torch value varies therefore also for which swing you got at the moment for the driver. It is important to know that some golfers are hitters with the irons and vice versa with the driver.
Sweetspot for driver
The loft depends on your impact angle with tour driver and where the golf ball hits the driver club face. Steep impact angle results in much backspin and no length. So the loft depends on IMPACT ANGLE
To hit long drives are many parameters that can be altered into the perfect conditions. However for amateurs the best thing is to buy a pro lesson and a custom fitting for fastest result.