BamBooBender
See-Moe
You might be right about the swing speed and lower lofts, it might be a good idea to have one hybrid in the bag, I seem to hit the X Hot 4 Hybrid better out of deep rough than the 5 Altitude, so it might be good to leave it in just for that reason.
Have you tried the x2 hot hybrids? I found them to be longer than the xhots by about 7 yds on average fwiw. The x hot 4 was as close as makes no difference to my altitude 4, distance wise.