Should Juggs be escorting?

With the jugg, I throw the hex shield out behind us on an escort ... both for the jugg's and squadmates' benefit ... essentially cover our flank as opposed to what is ahead of us ... unless of course, it makes more sense to put it up front ... say for a Scion, Ravager or turret. Also use the geth turret ... mostly as a distraction, but also for shield replen of jugg/squadmates and reload cancel for high power/long animation weapon reloads for the jugg.

To make the jugg more tanky ... especially if you are going to draw agro away ... opt for the full evo on shields (hardened platform), so you end up with either 6/6/4/4/6 or 6/6/3/5/6 ... depending on whether you want evo 4 in turret or would rather have evo 5 in Geth jugg. 

With the hex shield, I opt for the offensive build and the smaller shield at evolution six ... increased weapon damage ... vice going with the very large hex shield. Mostly it seems the large shield is a hindrance to squadmates shooting stuff ... which offsets the benefit of increased protection.  Evo six on small hex shield will restore 2/3 of the weapon damage you would otherwise lose for evo 6 on hardened platform (i.e. shields). Remember, that only works when the hex shield is deployed.

Conversely, I go the defensive route on the siege pulse, wrt damage reduction and numbers of pulses.  Again, to make the jugg more tanky.

An example of a Jugg build.

Ya know, it kind of boils down to what works best for you and your playing style.  The above is just one way that seems to work for me.