My experience has been identical to yours, so I'm not convinced that it isn't some inherent design issue. And yeah, the only way for me to get any low end is to EQ some in there. Not ideal, but the bass plays really well and I like the slap tone, so it's not going anywhere anytime soon.
Yeah, me too I guess.
It is a pleasure to play and the tone is really good with the extra bottom dialed in. Could certainly be worse—especially for the money in the Trib series. If I got this same response with a significantly more expensive US-made instrument I'd be less pleased for sure.

