My apologies I confused you with another member that had 30degree PAR38s.
Your 60degrees may be closer. Maybe start @ 8". Of course before your start cutting the cord.
If you are able to get Dimmable Bulbs it's worth the extra $. HomeDepot has Dimmer switches for LEDs.
Sounds like you are good to go. Back when I did mine I could not find pendant converters for the Track I bought. I bought two pendants then swapped in the IKEA cords.