I didn't see this anywhere so hopefully I'm not duplicating information.
Joe's Bakuretsuken (Px4) is +5 on hit. Means you can link the following commands after hitting someone:
1.st.A -5F
2.cr.A -4F
3.cr.B- 4F
4.cl.C - 5F
5.cr.C -5F
6.qcf,hcb+P -4F
For the sake of doing maximum damage, I will just use st.C and cr.C, but st.A works too.
A sample combos:
1. st.C, PPPP, qcf,hcb+P = 268 dmg, 1 bar
Links naturally, do the motion and hold punch to make it link
2. st.C, PPPP, st.C, f+B, qcf, hcb+P =348 dmg, 1 bar
(1F link, easier if you map two HP/C buttons)
3. st.C, PPPP, cr.C, df+B = 197 dmg, no bar
(1F link, no bar knockdown combo)