How do I bend EMT conduit to a broader radius?
Using the same hand-bending tools you already have, you can approximate a larger bend radius by leaving short sections of straight conduit in between multiple bends. Below is a picture showing the minimum radius bend you currently achieve with your hand tool (picture on top) and then using three segments of bending coupled with two straight lengths to approximate a larger radius (picture on bottom).



My example in the second picture only shows 5 segments since the picture was made relatively quickly in paint, but the more interspersed bent/straight segments you have, the closer you will get to approximating a true circular radius. However, maybe you don't truly need a semicircle in all cases and just a few segments would do the trick.

Other alternatives I can think of include:


Trying to create your own hand tool for achieving common bends (if you're bending the same larger radius often -- perhaps something like an 18" car rim would work)
Investing thousands in a pipe bender that can handle conduit and do very smooth arbitrary bends.