I know what you mean with those loud clubs... I did a research project which involved noise induced hearing loss in clubs and needless to say you won't be heard by a girl on the dancefloor unless you project loudly into hear ear.
Unless you ooze confidence and AMOGness, your opening attempts on the dance floor will mostly fail. Even though most good looking girls may be on the dance floor, they wont be there 100% of the time. Here are some tips if you wanna open on the loud dfloor:
1) Always have a higher energy level than girls
2) Have a good size social circle: At least with one girl pivot that will make you value increase
3) If you spot or lock eyes with a hottie, use the 3 second rule. Use the line "You look fun" with heaps of energy and grab her hand and twirl.
4) Never be caught "prowling" or checking out hot girls = DLV. You are having more fun than everyone else. Fun is infectious. Smile, Laugh, act spontaneous when you approach any girl. These are all traits of an AMOG
5)Never approach a girl/set directly in front or behind. Come in from an angle. Eye contact is so important. An amog knows what he wants. An AFC will act shy and hope she'll open him... Rarely happens... You have to make the move.
6) There are always quieter parts in the clubs you can game girls and run openers and routines. I generally use the dance floor as a location shift after getting IOI's. Think of it this way. Would you walk up to a girl or set in the street and use body language to get her to like you?? No, you have a reason to approach her.
7) If you approach a girl on the dance floor - a proven way of getting rid of her bitch shield is the line - "Too bad i'm gay or you'd so be my type"... It's not lying, it's flirting. Basically a way of saying she's hot but not look like an AFC.
Tips for next time:
*Try opening sets in the lines or outside - Ask an opinion opener: "Who lies more" of "Jealous girlfriend opener" - Act as if you have somewhere to go until the hookpoint when they accept you into the convo
* Ask a set if they know where a particular bar is then directly open
e.g "You guys know where I/we can find Cassette?"
Girls give directions
"How far is it?"
They tell you.. then cut them off in the middle and act cocky
"I actually made that up, I just thought you/you guys were cute! Like literally I don't care where it is

"
Cut that thread and ask for their names and introduce yourself.. Maybe ask them how they know each other... Then run a routine if you want.
If there's any resistance then you can always just say you gotta go but give me your number and we should hang out.. if that fails then politely excuse yourself.
The key is to be confident.. look each person in the eye... and act cocky/funny.
Its all trial and error. The more you approach the more you are likely to succeed.
Hope this helps,
Lovebird
Had a try with it last night, seemed to work.
Although, most of the good looking girls are on the dance floor with the Clubs I tend to go to such as: Margies, Met and Code, Cassette, Globe ( the usual 18-20 clubs/bars). Was there any that you knew that could be better for sarging?