Kypchak rounding harmony

In one dialect of Kyrgyz, there's an asymmetry in the system of vowel-rounding harmony.

Kazakh

In Kazakh, the roundness feature was lost on non-first syllables (except for with so-called long vowels), but rounding harmony makes up for this:

• */bu/+/kün/ > */bügün/
• */bügün/ > /bügin/ (modern orthographic/underlying form)
• /bügin/ > [bügün] (rounding harmony creates modern spoken form)

Examples of rounding harmony working:

• /jüremin/ [jürömün]
• /köremin/ [körömün]
• /sordım/ [sordum]
• /buldım/ [buldum]

Examples of rounding harmony not working:

• /turamın/ [turamın]
• /bulamın/ [bulamın]
• /soramın/ [soramın] (Kg: ?[soromun])

Kazakh's vowel system

As best I can tell:

• ı
• i +front
• u +round
• ü +front,+round

• a -high,(+low?)
• o +round,(-high)
• e +front,(-high)
• ö +front,+round,-high
• ä +front,-high,+low

• features that spread: +front,+low,+round
• features that don't spread: -high

another possibility:

• ı
• i +front
• u +round
• ü +front,+round

• a +ATR
• o +ATR,+round
• e +ATR,+front
• ö +ATR,+front,+round
• ä -ATR,+front(,-high??)

• features that spread: +front,+round
• features that don't spread: ±ATR

Kyrgyz

• V > [+rd] / V_[+rd] C_∅ __
• except not a > o / u C_∅ __