Don't know if anyone else has noticed this or not but you can CH 5b into 6C at pretty much any but the maximum range and then follow up with snaphance lv1 for about 3.8k meterless. Lv2 does about 4.7k.
Also heres a CH 5c combo that carries to the other end of the screen thats also probably been found already:
Lv1 5C, 6A, 5C, 5D, RC, 6B, j.B, j.C, j.D-D, 5C, 2C, 5D.
Alternatively you can go for the 50/50 or 236A instead of the 5D at the end. It does okay damage for a lv1 midscreen 50heat combo at about 4.7k