Hi I've lifted up anything from bridges to houses and usually goes like this. I use Hydrolic jacks to do the lifting and go to screw jacks or adjustable tube jacks to take up the slack... In other words Lift up S L O W L E Y about a 1/2 to an inch at a time and use the cheaper jacks to take up the slack and hold everything in place.. Going an inch or less a day....any cracking stop and hold everything in place and check out what it was. usually nothing but it could be a tenon or some bad thing letting loose .... And go on after holding everything in place... They now make those plastic things post hole bottoms that hold 20'000 lbs and up that have to be dug in below the frost line and I've heard some good reports on them...although I've dug out 4 X 4 foot holes in very wet land and filled and vibrated rock 3/4 to 1 1/2 inch and poured a 12 reinforced pad on top to hold the weight and keep any winter frost change anything......best of luck in the future..RMD