I also am confused like Billy. Are there simply gaps between the threads?
If you have gaps , try packing your pattern more frquently , like every few threads instead of waiting for the end. Also , apply some color preserver and let it get tacky. do the final packing while the color preserver is tacky and it acts like a glue to tighten up and eliminate spaces between the threads.
Another thing you can do is cheat the spacing a little short. Whenthe spacing is short , the diamonds elongate slightly sideways and that means the threads are less likely to slip away on the outside of the diamonds. You can't cheat a lot or you'll change the look but just a hair on the short side does help the packing.
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