<p>I've started printing PETG recently and I'm happy with results so far, awesome strength and good looking (except for stringing). But I've noticed that PETG prints better with more distance nozzle-plate than usual, and under-extrusion make parts looking better than both normal/over-extrusion.</p>

<ul>
<li>What distance nozzle-plate is optimal for PETG? (i.e. the distance between nozzle and build plate during calibration)</li>
<li>What extrusion percentage is optimal for PETG?</li>
</ul>

I have printed literally kilometers of 2.85 mm PETG filament on various 3D printers, and frankly, I do not share your opinion on an increased calibration distance/offset (like using thicker paper when levelling you build plate or increasing the Z offset by G-code
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). I even lower the default first layer height in Ultimaker Cura (0.2 mm prints fine). I am aware that on the web there are folks that do increase the calibration offset, or increase the first layer height, but that should not be necessary on a well tuned printer with sufficient first layer adhesion (e.g. printing on glass with 3DLAC).
Furthermore, the best extrusion multiplier for printing PETG is 100 % on a well tuned extruder for a constant diameter quality filament brand.