Nobility [Both Men and Women] receive that blanket extra 2" [Basically +10 pounds and a +1 to ST] and additional longevity a benefit of good food and breeding a benefit the wealthy freemen do not receive. Urban poor lose a little height and longevity.
The height is part of it - but as much or more of it is the mass a well nourished person will have. The 2" for nobles is probably about right, though extra mass would make sense too. Though I also think the son of a cottar would be at -1 like the urban poor, and those comparatively well off would get maybe a +1 on height and better mass (Those with at least 60 acres roughly for rural types, for urban types it's more problematic.
I use some houserules for height, weight, and strength. Weight (lean body mass) is +1% for every point over ten, and -1% for every point under 10. Frame is less of a factor - 8% + or - per frame catogory, and the only frame that alters agility is massive with a -1.
A numerical score, somewhere in the 5-20 range is assigned for size, and then strength is figured by (Size+Size+Strength)/3. So somone with size 20 (over about 250 pounds) is going to have a minimum strength of 14.
Not all knights of a poor bachelor knight will be squired in Harn because of the cost particularly if it involves purchasing a Coat of Arms at 5,000d for that younger grandson of the Clan Head with four sons at 5,000d a pop. Men at arms and careers in the church are the default unless other factors are at play (even more significant if using Kind support and only paying a salary of 1/3 or so in coin since in Harn (Not Lythia) most are paid as MH).
I guess I could put the requirement and cost of a Coat of Arms on the ideas that should be done away with thread
. I look at it differently - 5000d is the cost for a "New" Coat of Arms. If you are part of a clan that already has a Coast of arms, a knight can "subordinate" I think the term is or something like that, a slight variance in the coat of arms that designates that wearer. Maybe for a fee of 500d.
The true cost of knights is their training, armour, upkeep, mounts and the mounts upkeep - and this is a significant cost already - no need to arbitrarily increase that price.
All things being equal military recruiters are going to choose the more physically adept promising candidates when seeking new recruits especially at the upper tier where it is extremely expensive to train, equip and knight in Harn unless they are using their clan coat of arms.
It's again, not really picking the best ones out type of selection, it's that in general the first son will be chosen unless very inept and there is a second or third son as an option.
The First son can be 5'8" and even if the second son might be 6'2" - as long as the first son is not lame, mentally ill, etc.
I would think it would be a similar situation for Yeomen as well.
A think in order to get the correct frame of thought, it has to be thought of as many years of tradition with a family renewing it's feudal obligations with the new "heir" to these responsibilities, most often the first born son. If you think of it in this manor as opposed to an NFL training camp, I think the picture will be more accurate.