You need to get those caddy pads.
You need long/short gaffs depending on the tree. For example, a chunky ironbark I use longs, a pine tree I use longs, a cuban I use shorts.
But the caddie pads shit on those velcro pads and way cheaper.
http://www.wesspur.com/Spurs/spur_pads.html pads
http://www.wesspur.com/Spurs/spur_accessories.html replacement foam