If you think about manufacturing something like a flashlight, you can imagine that soldering little wires to the insides of both springs adds labor and cost to the production. If doing so offers an important advantage in lumen output over a competitor, it might be worth it; otherwise, it’s not.
Doing both bypasses gave another 200 lumen on the original-production light, but that light did not have a dual-spring tail. Your light may already achieve near its maximum output.
If I’m going to do a bypass, I’ll try to do both springs. However, my current-production A6 came with two springs on the tail, so I feel no need to mod it. If you do, the best approach is probably to remove the inner spring and put the bypass wire through the PCB to the switch. That’s a lot of hassle for little gain, though.
The A6/A1 only does Turbo for 45 seconds and can get very hot if you keep re-activating Turbo, so at some point you’re better off modding a different light. A C8 can absorb more heat and the larger head is easier to mod. Just sayin’ 
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I’m all in favor of modding your light, however, as that’s a large part of that BLF is about. A look through the forum history will show that members were often squeezing every possible lumen out of $15 lights. I encourage anyone to keep that tradition alive 
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Also see: