I had to re-do my new tongues after wearing them out as they tended to creep up. They also squeaked when I walked :S I had not properly secured them to the base of the tongue, so they crept up under the laces exposing the original tongue and I found myself having to pull them down a few times yesterday.
So last night I unpicked the stitching and re-did them. Now they stitched to the toe end of the original tongue. I am still not 100% happy with this and think the only way to fix this is to cut out the original tongue leaving an inch wide tab to sew to (upside down and facing the toe) that can be folded back and cover the stitches. The original pattern is made for a scratch build, not a retrofit, so I had to modify that to make this work.
https://scontent-a-lax.xx.fbcdn.net...1_10152502369018841_7208964638299281620_n.jpg
https://scontent-a-lax.xx.fbcdn.net...1_10152502368298841_7300240629703660940_n.jpg
When wearing, they seem to be about 1/2 taller than they should due to the original tongue being stretchy. I guess once I walk around they would settle and pull back down (which is why I wanted them extended in the first place) leaving that "just sticking over the strap look.
I've also stuffed a neoprene insert into the top part to help hold its shape and stop the wrinkling I was getting before.