My wife’s 5’3” the full length BP rub her upper thighs. At 5’6” your wife may be ok but I will tell you what most told me 5’8” is about the shortest you want in a full sized BP now this is from suppliers who don’t want me returning a purchase but someone with actual experience may know if there more wiggle room. But is seemed like 5’8”s is about the comfy point.
I stuff 5 pounds of weight in the weight pockets on my cinch system. The difference in ease of operation from 2 pounds to 5 pounds on each side is huge. I plan on adding more weight to the BP to reduce that not only for trimming but to make the cinch feature easier. One factor I liked about there travel BP but again can you get the right weights on a trip?
It’s not hard to do horizontal in the water though. One crowded boat dive we were crammed in there like sardines I had rental weights the solid six pounders on each side I could not get my cinch pulled down on the boat because I couldn’t move with all the crap happening on the boat. It was the worst boat dive above water to date and I got on a couple of really iffy wood boats in the Philippines with a typhoon in action. I had to adjust it in the water which was fine. Im a serious rough water fisherman it takes a lot for me to not enjoy being on a boat. Fortunately the dive was stellar and I had less regrets about how uncomfortable the boat ride was. My point here is the cinch can be hard to work in the wrong situation. And you are looking for a travel bc where your weights will be a factor quite often.
Let us know what you end up with. My sisters looking for new gear I’m trying to get her to look at the Apek.