This here bit:
Some people get longer shackles - it's a cheap way to get a bit of lift. But since you're only lifting from one side, you only get 50% of the extra length as lift (a 3" longer shackle will only lift you 1.5"). Long shackles can give seriously bad road manners.
Some people get stronger shackles, some get greasable ones. Some reverse the shackles on the front, so they're in the back of the spring. Some get fancy reversing-shackles that stay in the front of the spring, but fold the 'wrong' way.
They are a part that takes a lot of stress, so new ones are not unreasonable.