Puuh, too many questions for me already...
Should re-name that thread in "Ask LRP" or something as it's not just SPX StockSpec related anymore.
Will try to answer the questions about SXX vs. SPX vs. SphereComp.
80710 vs. 80700/80750:
- explained in my post #101 in this thread I guess.
80900 vs. 80950 (the two SXX versions):
same internal hardware, difference is only heatsink/fan.
So 80900 is lighter, lower profile and doesn't come with a fan.
80900/80950 stock profiles:
SXX doesn't have "extreme stock profiles".
Nevertheless the SXX's profiles 9+10 will be suited well for stock, but I would suggest #80710 for hardcore stock racers as it has more aggressive timing.
Profile comparison between 80900/80950 (SXX) and 80700/80750 (Sphere):
We do have a nice chart in our SXX manual, which does explain curve, limiter and timing for easier understanding. See attachment under chapter 7. "Mode Programming".
SXX's steps for power profiles are finer then Sphere's and also it starts at slightly lower power in profile 1. What comes now is not 100% precise, as many small things have changed, but give you a good start and help to understand the SXX if you already use a Sphere:
SXX #1 -> slightly lower power then Sphere #1, but close
SXX #2 -> inbetween Sphere's profiles #1 and #2
SXX #3 -> similar to Sphere #2
SXX #4 -> similar to Sphere #3
SXX #5 -> inbetween Sphere's profiles #3 and #4 (that was quite a big step)
SXX #6 -> similar to Sphere #4
SXX #7 -> similar to Sphere #5
SXX #8 -> similar to Sphere #6
SXX #9 -> similar to Sphere #7
SXX #10 -> similar to Sphere #8
As said before, none of the profiles is 100% but this is the closest I can explain it and got all the teamdrivers understanding it as well...