Let's say a check to defeat a monster is Strength or Melee 8.
If my character has a Strength d6 and a Melee (Strength) of +2, then it seems obvious I am using the Melee skill (d6+2).
However, if I complete the Perils of the Lost Coast adventure my character gets a Skill Feat. If I add +1 to Strength, does the above roll change? For example, is it now d6+3 (where I get +1 for using a Strength based skill and the +2 from Melee)? Or, do I choose between Melee d6+2 and Strength d6+1?
Another way to ask the question is if the primary skill bonuses carry over into the secondary skill.
(The way our group has been playing it is that the roll would be d6+3. However, after completing both adventure Perils of the Lost Coast and the Attack on Sandpoint scenario (both giving a skill feat as rewards) our characters seem to be getting overpowered.)
You're melee die will be +3.
Yes, the primary skill will roll over into the secondary, but not vice versa.
So if you bump Str (d6) to +1, then you would get 1d6 +1 +2(for melee), in a melee attack.
If you are doing a Str check (not melee) then you would get 1d6 +1.
If you had a choice to bump the melee not str +1, then that +1 would only apply in a Str->Melee check.