Leveling and tire questions

Hello all,
I'm new to this forum. I just bought a lightly used 2015 Tacoma, crew cab, long bed, TRD sport model. I wanted to level it so, today, I put Bilstein 5100's on it, set to the 1.75" setting. Before hand, the front was just about 2" lower than the rear. Now, although it is noticeably higher, the front is still about 7/8" lower than the rear. I'm wondering if that is a typical result for this model and also wondering if I should have gone with the top setting, although I imagine that would have put it over. It definitely rides better now.

Also, I'm putting 20"x9" wheels on it with 5" backspacing and 275/55 R 20 tires on it. I had intended to go with the BFG KO2's but, when talking with the guy at 4Wheel Parts, he said that those tires are too heavy for my truck and that I would get a lot of vibration when going over bumps and pot holes. He suggested that I find a lighter tire, like a passenger tire with all weather tread. So, I'm wondering what experience others with this or a similar setup have had and if you have any recommendations for tires.

I guess I should add that I'm mostly a freeway driver with occasional fire road and snow driving but no real whomping.