You might only be getting 7 inches of throw on that bottle jack. Is that enough to, say, change a tire? Wouldn't you lose many of those inches to suspension lift? To go more than 7", you'd need to prop up the vehicle with something else (like a jack stand), retract the jack, and add a wood spacer to increase the throw. Have you gotten to actually using that jack in the field on your truck?
It's got 11" of lift plus something like 3 that can be screwed up. I'm not sure how much it will really need in the field but I did shop for one that had a little more lift than some that as you say only have 7" and I doubt how well that would do, probably not all I need. Would a jack stand or just some wood blocks be the way to insure the job can be done? Jack it, block it, jack it again after blocking the jack up some more? I will test it to see how it looks.