[Old Goat Ninja]

Should be fine. Same bars I have without issue.

Are you hung up on the end? Too far left will make bar rub on end of grip. Is the grip on?

Did you drill a hole for clamp? Or remove nub that goes into hole?

Those shouldn't matter really, but something is off, and you have to backtrack starting from somewhere,

 

[Old Goat Ninja]

Na, you don't need the bar ends. Are the stock grips still on? Or new grips?

 

[Old Goat Ninja]

Sounds like your grip is hitting the end of the bar. Loosen and move right 1/8" of an inch.

 

[Old Goat Ninja]

Make sure the part where the throttle cables are attached to the tube is sitting in the right location, almost sounds like when you've got it on the bar they'r eout of place so when tightening down it's tightening onto the actual throttle cable part.
Not sure if that made sense but hopefully it did.

Made perfect since, and this could be it also. Make sure the cable is in the channel.