How much of the pins are glowing on your dekatrons? It looks like just the top portion is glowing on the first cathode in the photo. If only a small portion is glowing that will affect the wear of the pin. Also, what current are the cathodes run at? If a dekatron has been in storage for a long time, or if it has seen a lot of use the pins can be affected by cathode poisoning, they can be fixed by running them at high speed with a little bit higher current to get the shine to cover the pin fully. Some are hard to get to cover the pin fully but running them in the reverse direction (if possible) sometimes helps.
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