For pughs, if the majority of your team does not wear a pugh on a regular basis/rarely wears one, I think it would be a good idea for them to practice with pughs every once in a while. I have seen so many guys who only wear a pugh on the day of the competition fidgeting with their pugh before they get on stage to the point where they are pushing the turla out of their pugh and ruining the larhs.
And make sure you make it clear to everyone that once your pugh is tied, you do not touch it. If it hurts because its tied too tight, suck it up, lol. For a turlay vali pugh, it is going to be tied pretty tight, because you dont want it to get loose when you are dancing.
I know for most of the guys who tie pughs on daily basis anyway, it is never a problem...I have never seen a sardar's pugh come off on stage. So I think not being used to wearing one is one of the main reasons they come off so often for teams as people are always loosening it up before they get on stage by pushing on the sides or sticking their fingers on the sides or the middle. And Arjun's suggestion is right on, the patti will make a big difference in the tightening of the pugh.
The way most traditional teams do it is turla in the front for dancers, and side for band. I think the reason SGPD did it side in that wedding vid. is b/c they are just easier to tie on the side, and they might have just decided it was easier to do side turlay for a non competition, b/c I know we did that a couple times too.
As far as chadray, I think a lot of people get nervous when their chadra is a little low because they think they will trip over it or something, so they tie it real high. The bottom of your chadra should be just about touching the ground and also tied very tight. And if they are just genuinely too short, maybe just invest in some new ones, b/c chadras alone don't cost you very much. Just make sure you check out the material before you buy it because some are just too stiff (thats what she said).