Have you clarified the Mayhem pack rules with your friends? There is some question as to whether they can roll on their chart after they
DS. If they can then they will be a nice addition. If not then it is kind of sad and you may be disappointed.
Your biggest problem will be issues with scoring. I would swap a greater on the thirster for an exalted to get a portaglyph. This would give you at least a chance for some extra scoring.
The mace is definitely worth it over the axe. Your
MC is already
AP 2 so you loose nothing and gain a lot.
What are the icons on the letters for? If you
DS them both in then you have no guarantee you will even be able to use the icons.
A weird unit I have been messing with and has done well for me is 3-5 bloodcrushers + karanak w/ an axe on the hunter. You can also put an icon on the unit if you want to
DS units in near it. With scout and cavalry movement you can get them pretty much anywhere on the board. They are also not bad in combat and I have found the current S6-7 meta makes them fairly resilient.
Bloodslaughters are awesome. Absolutely love the model. No harpoon though makes me sad. Everybody just wishes they could harpoon enemies.
Your fleshhounds might be a bit disappointing as they don't have the numbers to really contribute. Not a lot you can do about it without removing other elements in your list though.
You will probably have morale issues with your oblits. If you don't take
VotLW there is a good chance one will die and the other will run, which is so not oblit style. Without marks and
VotLW they are usually better of with 1 oblit per slot.
You will probably find your
CSM running away a lot. Rather than savage and elite they are more scaredy cats without a leader. This is the dilema of
CSM. Pretty much the best you can do to make them "savage and elite" without getting a special character in there is to put them into a building which will make them fearless. A simple bastion would provide
LoS blocking terrain for your daemon units, protect your
CSM from running like chickens, and you could even give them a quadd gun to make their contribution meaningful. Strip them down naked in return because
CSM who aren't dedicated don't deserve nice toys like plasma guns
The quad gun will also help with your other problem which is extreme lack of long range mid strength firepower. Your eldar opponent has excellent AV10 and AV12 vehicles that you will have difficulties catching and melta is not super effective. Having an extra 4
TL BS4 Str7 shots will certainly help.
An imperial bunker with quadd gun is a less pts but more money approach to the same problem. The bastion comes in chaos theme though.