I have noticed this also, only It's hit and miss with me lately, one tube may be fine, then the next will have problems. I have also noticed the air in the tubes, wonder if that could have anything to do with the bad glue, because I have noticed in the past That I have to use a new tube everytime or would have problems even before all the air showed up in the tubes. I use a new tube everytime I do a tipping session, and that seems to help.
I come accross those type ferrules also Chris, there is something delrinish about them like you mentioned, and can be tricky to get to stick sometimes. Altough the shine up nice, Some even swell from the heat if you burmish them. Funny thing though, is I have shot with one of these ferrules, and some seem to play decent for what seems to be elcheapo ferrules. Some of the cues they come on are known to play decent for an import, so maybe that is why they use them even on the better imports.
I have been thinking about trying the 454 also. Does anyone know what the drying time is on It? I have not got around to trying It yet. Duro has always worked for me, so have just stuck with it till now.
Thanks, Greg