OK, I missed that in your original post. Sorry.

I don't normally use two jigs but, if I did, I'd try it this way:

Tie on the first jig with the loop knot of your choice. Then, ABOVE that jig, I would tie a 12-15" piece of line to the main line with a surgeon's KNOT (not a surgeon's LOOP). Then, I would tie the second jig to that short piece of line with the loop knot of your choice.