To maximize rampage blast:
+12 Old Blazing Soul
+13 Abusive Dex6 enchant
+15 Crimson Mace with 2 True Chen or if you have high total STR use +14 Robot's Arm with 2 True Chen
+8 gaia or anemos shield
+9FAW of Shooter E4 EA2 EA1 enchants
+9 temporal str boots EA4 BP or HE
Fairy Powder of Mad Berserker
Black Smith Gloves of Mad Berserker
how about
+12 Old Blazing Soul
Tengu Mask
Tengu Scroll
+11~+13 Abusive Robe Str4~6 Enchant
+10~14 Robot's Arm / Spartacus [2]
+12 Mad Bunny Shield [1]
+9 Wakwak Faw EA4 EA2 EA1
+9 Temporal Str EA4 BP
Fairy Leaf Powder of Mad Berserker
Giant Protection of Mad Berserker
Have a balance between Range modif & Atk%
I'm guessing that a Mad Bunny Shield can produce significant damage compare to gaia/amemos
the reflect from MBS is awesome for GT gain as well.
Since BSG will not be giving you much damage on lower def mob (unless you specifically know what you attacking),
else for default setup, go for GP
high Str and get your damage boost from Tengu Set & Giant Protection as well as your level4 weapon