As @Lolo says, if you make the seat tube steeper, you'll get a shorter ETT (by insersecting the horizontal closer to the front) but this is only a problem if you can't get enough layback to put your saddle in the same place relative the BB and bars.
@edscoble has a good gif for this
@dancing james started
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As @Lolo says, if you make the seat tube steeper, you'll get a shorter ETT (by insersecting the horizontal closer to the front) but this is only a problem if you can't get enough layback to put your saddle in the same place relative the BB and bars.