Test your maxes as if it were a normal training week, meaning that you test the lift you would train on that day... for example if you plan on training the bench press on monday, then test it on monday.
BTW the "max" should be a technically solid max. The percentages need to be based on "your best performance". If that best performance has you cheat the barbell up or use bad form then it will screw up the whole progression plan. If you bench 275 with solid form then get 285 but it goes up and your butt gets off the bench, or you bounce in on your chest, the 275 count, not the 285. If you squat and cut depth to get more weight, it doesn't count. If you deadlift with a fishing rod round back, it doesn't count. Those who fail using the 915 misevaluate their maxes.
Unless you are a skilled olympic lifter, go with the snatch high pull. With the clean high pull people tend to use their arms too early and too much.