Same height and inseam as your self and I can second the Cabela's being hit or miss with the sizing.
I do have a couple of items from first lite purchased this year, so newer sizing. I find myself to be an XL in things where I would like more of an athletic fit, and an xxl if I'k looking for more of a casual fit. I find most of FL things to be VERY stretchy so I generally prefer a closer fit so as not to risk snagging. First lite pants are quite long and I find the tall almost too long, I go with XL regualr if it's an active pant and I intend to wear gaiters.
On a side not for the Cabela's items, I just recently got a chance to check out their newly revamped instinct line which I interpret to be squarely aimed at the western FL, Sitka and Kuiu wearing crowd. All they had in store were the base and mid layers but I was very impressed, I was wearing the Kalamth hoody from FL at the time and the instinct 1/4 zip mid layer is literally identical to it, same fabric, weight, finish and quality, Cabela's new camo pattern(which I must say I like a real lot) had the addition of a face mask ala sitka and I found the sizing to be identical to FL, at 6'5" I could wear an XL having enough sleeve and torso length and a slightly fitted feel, the xxl was just a touch baggy.