We don't know what happened to the previous cam but the heat treat on our Pro LS cams gives the lobe consistent hardness 360 degrees around the lobe because we do them in large production runs.
Stage 4 8709R1 is a 237/246 113 + 3 and .625/.605. Overlap is 14 degrees It's designed to be the biggest cam one can put in without flycutting.
SUM-8711R1 (stage 4 extra valve clearance version) is a 234//247 113.5 + 3.5 cam and we back up the intake closing point 3 degres to pick up midrange at the expense of the peak. Works well with non aftermarket intakes with smaller throttle bodies and non-ported heads that start to wheeze up top. It's also the one to use if you mill the heads .030 to pick up compression (very worth it for gains across the rpm span). It's a very powerful cam that people love and it gets the car down track. The next one down is the Stage 3
SUM-8710R1 230/242 113 + 3 .625/.605. That one in a LS3 is down about 6 horseepower at the peak compared to 8711R1 but it picks up 15 ft./lbs at 3500 and pretty much outpowers 8711R1 up to 6k and is very streetable. It's usally the one we like with a 24X computer because it's intake opening is a couple degrees later and overlaps drops 4 degrees and is quite a bit easier to tune to satisfaction. Agreed with Aaron that anytime you are getting up there in overlap, a long tube header produces bigger dividends.