the key to trapping is how you set your mind.. for me.
Are you thinking of hiting or protecting?
the key to trapping is to protect,hiting comes natural.
the other key is to really understand the reasoning behind the ideas, then force them into muscle memory.
If you don't have the two .. its very hard to get things working.
I don't know how JKD goes about trapping, but I (WC)use it a constant .. goal.
do you have any clips of trapping in JKD?