Hi Barras,
Currently MMS has:
5+ armour on everything except the destroyers (NS, HL, SH) which have 4+.
I have playtested 5+/4+ on all and this worked fine.
(Ah main complaint about MMS in the past has been that resilience is too high.
They suffer critical hits on a 5+.
Holofield does offer no protection under 15cm.
Right shift above 15cm
And saving throw vs lances depending on range.
Eldar ships have shields:
Battleships 3
Cruisers 2
Light Cruisers 1
Also, under MMS v1.9 Eldar Corsair & Craftworld behave and feel differently.
Now for the CWE I could understand a lowering of speed in return of the gain of longer ranged weaponry (~45cm on all).
But if the speedbands are 10/15/20 for cruisers they'll be operating at speeds per movement phase of:
20cm (slowest)
25cm
30cm
35cm
40cm (fastest)
Is this enough to represent a fast & manoeuvrable fleet which the CWE still should be in my opinion. The ships have two 45* turns in general.
Firstly. No matter how light you make your ships. If the enemy cannot shoot you, you are invulnerable. These MSM and terrain game mechanics were critically flawed since there conception. That being said.
If you are going to remove this mechanic from the fleet, then you can no longer have a tin foil fleet representing Eldar. The new MMS rules are a good start when it comes to CE. The CWE should be a vastly different fleet as CE and CWE have conflicting roles within their creators purposes. I am not saying that fleets cannot not be adapted, but they are built with a purpose.
To what you have said. I Understand where you are coming from on this and I actually agree with you to a point. I am looking for balanced, logical and acceptable changes within the rules that people with agree to. I am looking for a way of giving survivability to the CW Eldar ships. Space is not like a battlefield where you can retrieve the soul stones of the fallen after the battle. When an Eldar ship is destroyed, they lose those souls. Eldar cannot afford these loses.
Eldar ships should not be lightly armoured unless they have an alternate method of keeping themselves alive. They have speed and terrain to keep themselves alive in the old rules. 5+ armour just does not cut it in MMS, even with the holofields. Giving them 6+ armour will not be accepted by the majority of the community. So the main change I was presenting was the holofields and shields changes. These would represent the Eldar being able to get far more out of their armour than any other race due to their technological efficiency. The movement reduction was to try to placet people.
For those of you who did not read and understand the holofields/shields or cannot do the maths, here is the simplifaction.
For each hit you roll against CWE, re roll it.
Armour of 3+ when rolling to hit it twice means you miss 20 out of 36 shots. This means it is better than 4+ armour which is 18/36
5+ on the front is actually better than 6+ armour. This is where I was expecting the complaints. lol. 30/36 vrs 32/36 misses.
I also mentioned that these rules would require more points and or less firepower then the CE.
It's not just speed the Eldar have but the manoeuvrability (as you mentioned). They can out maneuver escorts! The slower movement Eldar with full firepower would still be quite quick under these rules compared with other races. A 0-40cm move with 30cm range guns will still give you the initiative in a lot scenarios. Being a defensive navy, why would CWE need as much speed as CE? The CWE are the ones being attacked. They can not afford to run away while the Craft World is in danger. What is the purpose of all that speed?
Maybe, if your looking to speed them up a bit, they could have all ahead full and it would give them a 5cm bonus to all movement bands (no turn restrictions) and half weapons.
Ack more rules.... I guess that ones out!

Besides I don't really like it myself!
@ Sig. I agree with you that Eldar should have 6+ armour on their ships. This is logical based upon a dying yet technically advanced race. They must preserve numbers. However the mainstream do not agree with this line of thought. So the only other way of getting the Eldar to be tougher is to look for alternatives. I have tried hardening them up but they wont eat their concrete!