What 'breaks' on floating loops it the connection holding it to the webbing or D-ring.
This is an example of what you write that alienates people. You speak authoritatively on issues that you have absolutely zero credible experience to discuss. You are wrong... but you present information as if you were an expert. You are not an expert.
How you wrote this sentence implies that sliding loop bungees 'break'. They do not. This has been explained to you. But you phrase your hypothesis and assumptions as if you spoke from a factual basis.
For the record, there has been no trend or observed issue with properly configured loop bungees breaking. You will not find this issue mentioned anywhere.... because it doesn't exist.
You may have once dicked around trying to play with a loop bungee for a
couple of dives... but you did it wrong. You used the wrong bungee type, in the wrong place, with the wrong tensions... and it sounds like you can't tie a reliable knot either. That's utterly YOUR failure, not the system.
Seriously... what sort of sidemount 'expert' can't figure that 3mm bungee is woefully under-strength or tie a reliable overhand knot. I'm surprised with this lack of 'wisdom' and technique, given your stated 1000 dives sidemount experience. It reduces your credibility drastically... as does most of the garbage you write.
Now, personally, I couldn't care less what drivel you spouted, but I do care that someone honestly looking for guidance might come to this thread and misunderstand the nature of the fantasy you perpetuate. I wouldn't want someone to think they were making an 'informed' decision based on some deluded internet fantasist.
Please do the forum a service... and clearly state where you are only hypothesizing. In truth, you'd garner a lot more respect if you
asked about things you didn't understand or didn't have experience with.
I've been diving sidemount far longer than you, with many more dives, more frequently and routinely on vastly higher levels of diving challenge. I teach sidemount at levels you could only aspire to. But I still
ask and
research what I don't know. That's what I did with loop bungees... and every other modification, tweak or method that I've trialed and/or incorporated over the years. Having asked..learned the issues, options and the finer-points, I put the method into effect. Not for a handful of dives... but over a reasonably significant period, so that I can reasonably eliminate any issues that stem from a lack of familiarity, skill deficit, specific inexperience etc etc.. Sample size of dives and reducing the 'human factor' is important.
I take responsibility for every gram of advice I give on public forums. You said, or inferred, that you were an instructor yourself... so I am surprised you don't appreciate the value and ethics of that approach.