There are higher torque starters but they are for 1.0 size engines and up. In fact I start my Saito 1.0 with a regular Hobbico starter (same torque as the Tower Hobbies)
Capo915 suggested :
"One, you need a "running" start for your starter. Meaning start the starter a second before you you apply it to the prop."
A guy at my field has a habit of doing this. Bugs the heck out of me but it is their engine.Jamming the starter onto the engine adds extra wear to the bearings.Not to mention the chance of not hitting the spinner square which can throw your starter, hand and all, through the prop when the engine starts.YES this can happen, it happened to me before I knew better. Luckily the starter stopped the engine before my hand got to the prop.
As CGRetired suggested, move your prop clockwise to just before the compression starts, put your starter on and it will go unless you are hydrolocked.
Make sure your battery has a good charge. That is the most likely problem with not having enough torque.