Your container is the obvious item in question. after that I would increase your carb to 14 or 15psi and/or drop temp.
Is this an ale? per the force carb chart http://www.kegerators.com/carbonation-table.php 45F at 12PSI is the very min volumes of CO2 for lagers and ales. if your temp is...
the method on page one and in the video should not loose carb. I just opened a bottle yesterday that was 60days in fridge and the carb was great.
The video is basically showing you the method described on page one. although it is a good video he does not show you to completion since he is using...
I have a keg of starsan that I use to clean it out. I also use MFL coupled gas and liquid on all my lines. I will ether blow it out with starsan then remove the coupler and open the picnic tap and dry it out or open the picnic tap and hold the decoupled end to the faucet and run water thru it...
I can only describe what is different in my set up vs. yours. I dont know if it will solve your issues.
You may try this at a higher psi also. I usually am ~8-10 psi. I feel that if the beer is carbed to 12-15 when it hits the beer line it expands foaming
1. I am using ~10feet 3/16 ID...
Soooo disregard teh first 12min! he is just going over a tap insert.
at 12min he fills a bottle basicly the same way we are. its a great video for seeing the fill, topoff, and cap process.
In this video a different homebrewer showes a good view of a fill. unfortunately he stopps prior...
I read every page up to ~90 before I tried it the first time (next 10pages came durring my adventure) and still had issues the first 3 times I bottled. I had bad foaming issues during bottling and low carb issues after. Finally the 3rd time was acceptable and the 4th and 5th worked well...