If anyones interested, here's how customize my squeegees.
The channel ends are cut off at an angle. This gets the squeegee right into corners on deep recess windows without having to line it up with the frame.
I don't 'dog ear' but I do very slightly bend the whole channel which gives the same result.
On the handle, I bend the bit that holds the channel out a bit so it's less claw shaped. This lets you finish off perfectly again on deep recess windows. The only problem with the last bit is that it isn't suited to pole work where the 'claw' comes in handy. I use a standard handle for that.