Let's see, neither of those are really that aggro.
Reality Acid is bouncy removal, and Dredge can be explosive fatties but sometimes slow to start off. I think the best foil to both of those would be a weenie approach. Goes wider than Acid Trip can keep up with, and (hopefully) under the fatties.
R Goblins or W Soldiers could be a fun way to race with them. Soldiers has access to removal in
Journey to Nowhere and
Faith's Fetters, Goblins has access to bolt,
Flame Slash,
Fiery Conclusion and
Lightning Axe for the fatties. There is also straight up burn, but I haven't played it in pauper so I can't tell if it is fun or not. I have played soldiers and it is definitely a fun deck for me.
And of course, there is always some flavor of Tron to play with