The codex just says "This attack may make a second attack against the same target. The additional attack occurs before the counterstrike step of the attack".
This doesn't mention the removal of bonuses. Is there another mention of it I've missed?
If so - designers, please make your codex clearer! Thank you
Edit: Have re-read through the entire rules, and can see no mention of Melee+X bonus only applying to the first attack. Maybe this is an Arena only rule?
Edit 2: Have searched the online Arena rule book, and no mention of it in there either, except for specific spells (i.e. Bloodthirsty) only.
Therefore, unless someone can find it I'll presume the second (or more) attack includes all bonuses applied to the first. Which means I totally beat my opponent yesterday with one super charged attacked that critted doublestrike for 20 damage just as they thought they were about to beat me! Tentative Mwhahaha