I know, it doesn't make any sense, right? 6.75W IS 6.75W. But give 2Ω cartos a try - Kick doesn't work really well with 3+ Ω cartos and even tho your cartos said 3Ω, it could be 3.2 or even 3.4Ω (measure it if you can) and that could kick the Kick (no pun) wacky.
Bolt has wires to connect the switch to battery & connector, so personally I put it into 'electrical switch' category and no it's not 'all mechanical'. Mechanical doesn't need wire for the switch.
I agree with you about the wires! Yea, I was wondering about the 2ohm carto's. I knew it wasn't good above 3 and that some carts hit above that. May explain why I seem to have this one flavor loaded that I just cannot dial in no matter what. But, Thanks for the tip, I know now to order the 2ohm carts next! You ever tried 2.5?