That formula's funny. It puts my current draw at over 188 amps, but I only have a 100A fuse that's never blown. . It jumps to almost 290 amps with the new amps I'm planning on installing, according to the formula.

Your total amp draw really should not exceed 50 amps, unless you run both amps past their recommended limits. Your Basslink requires a 20 amp fuse and your Alpine amp requires a 30 amp fuse, so replace the 30A fuse with a 50A.

You could either splice another 8 ga. wire into your existing 8 ga. wire somewhere in the back, or you could use a distribution block. Both ways work and do the same thing. Rewiring shouldn't take too long though, if you really wanted to do it. I have a 97 Accord and running a 4 ga. wire to the trunk shouldn't take me anymore than an hour, if that.