There are no absolutes, here. Different players will like different types of set-ups better (higher or lower venting). Some very advanced players, the kind that tend to play very heavy reed/mouthpiece set-ups (e.g. 4 or 4.5 or harder and .120-.130 on tenor) will tend to prefer a different set-up from a beginner who can't and doesn't put as much pressure on the instrument.
The heights are too low or too high depending on some obvious factors -- whether the scale is uneven or even, whether intonation is uneven or even for you -- and then after that it's about what feels right to you (which may change over time). Your set-up is also a factor here in another way, in that your mouthpiece will have its own tendencies in terms of its evenness or unevenness of scale; some mouthpieces may discover a venting issue on a given horn/set-up where another mouthpiece (or even reed) will not. The only way to find out what really feels right to you is to experiment. It can be a difficult exploration for players in terms of expense, unless you can learn to close and open heights yourself.
One random, but valuable tip (not necessarily applicable to the OP): in terms of how it feels to play, sometimes what you perceive as a hitch or flaw in venting/attack/legato-feel can actually be something ergonomic. Example: if your low Eb is not in a comfortable place, it can make the response feel like it's off, when it's actually the position of your hand and an ergonomic issue that is just perceived as a response issue.