The speed of Eldar sees them able to pull off some manoeuvres that others could not. I myself am not sold on a fragile Eldar from a fluff point of view. The whole trade-off of resilience for speed seems fine for a race of equal tech levels, but Eldar are supposed to surpass the younger races in technology, so it really shouldn't be a trade-off, but rather an extra in one field.
However, play testing a more resilient Eldar saw them able to run circles around the enemy, take what they had on the chin, and still put out considerable firepower. They were too strong. Note however, that even though the Eldar were too strong (practically unbeatable), my opponents still came away happy with the games. This is because they could actually shoot at my ships and had a feeling of actually accomplishing something. So it was a step in the right direction.
I think that the Eldar have been cut back a little far myself, I think that the Dying Race rule should be used as standard. This gives them a better up front resilience, but they fall away quickly in battles of attrition, and the losses matter more to them.
As for strategy, well, even flying into point blank range and unloading all guns to cripple some of the enemy ships can work for Eldar. Because they would simply brace against everything coming back at them. Then, next turn, shoot past the enemy, preferably into cover, where they can wait for the BFI to drop off and line up another attack run.
If the Eldar are able to get close enough when doing this then the minimum movement of the enemy will usually put them beside the Eldar ships, therefore shooting at an abeam (braced) target. It's still risky of course, and Eldar are better served by flanking, putting themselves just in range to shoot and positioning so that at least their target will move into their side arc with their minimum movement. Following turns they can move around to the rear of the enemy. Some of the enemy may get bow shots off, but not terribly likely to be on LO while doing so.
Basically with the movement of the Eldar they get first strike. So return fire is mitigated by the enemy being either braced, crippled, or on a movement order (such as BR or CTNH) to allow them to get a better position and firing solution. Coupled with the more or less free use of BFI on the Eldar part when in close and holofields to reduce long range pot shots the Eldar are fairly resilient. If you get a bow shot within 15cm on LO, they will melt. Most of the time you don't get all three of these things given Eldar movement.
Having said all that, I prefer the 6+ prow, 4+ side and 5+ rear profile, particularly for CWE. This would change their tactics to be less oblique and more head on.