LOL yeah Uppland you are quite tall for this...but if you want to be as tall as your dad...if it really bothers you that much...just know that LL is really hard, really long, and the recovery period can seem like forever. I mean...I don't have tall siblings, a tall father, or live in a tall country...so I can't comment on how I'd feel in your situation. But if it bothers you that much, then go for it.
I also round down, so I take my evening height as gospel. I still have some duckass (a fair amount, actually), but not counting on it to help at all. I'm fine with saying I'm 5'8" because some days my evening height is a bit over, some days a bit under. It's fine for now. At worst, I suppose I consider myself a very slightly weak 5'8", which isn't too terrible.
I honest to God think I would feel 100% satisfied at 5'9" or even like 5'8.75" evening height. To me, that's on the lower end of average, but still safely within the average zone and above that critical 5'8" mark (which I'm right on the line right now). If you've done half as much online dating as I have, you see the following three thresholds a lot: 6ft, 5'10 and 5'8. I'll never see 6ft or 5'10, but as long as I'm safely over 5'8/pushing 5'9"...I can totally live with that.