yea i think the only thing i will upgrade is my armor for more defense/light level. attack values only come into play when your going against enemies that are higher level then you.
tested this out with my friend who had a 300 attack suros and a 274 attack suros. both did the same damage on a level 28 dreg (him being level 29). the only difference we noticed was when he dropped his light level to 26 and shot the dreg. the 300 attack did more damage.
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This. Attack isnt as important if you are the same level or higher than the enemy. Basically only upgrade weapons that are favorites or you think will function well in the hard mode.