New thresholds for 1e (I didn't do for under 8 Str, but you can iterate) :
8-11 Str = With 8 free slots you have speed 120', 5 = 90', 2 = 60', 0 = 30'.
12-15 = 7/4/1/0.
16 = 6/3/0/NA, meaning at 0 free slot you're at 60', you can only be more encumbered in special circumstances.
17 = 5/2/0/NA.
18 = 3/0/NA/NA, meaning under normal circumstances and without armor, you can't go under 90'.
18.01-18.50 = 1/0/NA/NA.
18.51-18.99 = You are always at 120' without armor, and can also carry a person/object of around 150lbs with both arms at speed 30'.
18.00 = Same, but you can carry either one person/object of up to 150lbs while staying at 40, or one of 300lbs (or two of +-150 lbs, one in each arm) at 30'.