A few things about Mrd
1. Str does not increase your acc. Ive done a through test on it by putting my stats at 174/min str/dex and slowly changing it to min/174 str/dex. My acc. was all but nonexistent with no dex and slowly got better the more dex I put in. I did notice harshly diminished returns after passing the 100+ dex mark so I just leave it hovering around there.
2. +Acc rings are your friend. For the same reason as point #1 adding more dex past 100 gives you minimal returns while the silver rings boost the stat directly.
3. To avoid the frustration of boosting up your 3000TP maim only to whiff I present a simple solution. Put Hawk Eye into your boost regimen.
Ferocity--> Raging Strike--> Bloodbath II (if I'm tanking and need HP)--> Hawk eye--> Maim
This is a devastating combo that not only greatly boosts your enimty but will hit extremely hard and rarely miss.
And if you aren't tanking it might be best to keep raging strike/ferocity/bloodbath off the list because that many boost in a row will almost always piss the mob off. Keep your tank happy.
Also keep in mind that this regimen can be used with storms path as well, hawk eye will boost it's accuracy toward all mobs within it's range, letting you nail nearly all of them for massive total damage. Watch the yellow numbers rain, BIG yellow numbers.
4. If you are still paranoid about missing and don't want to waste Hawk Eye on something less significant like skull sunder consider sticking skill precision (glad) onto your skillbar. I haven't been able to throughly test It's effect on my acc. but hey, its something extra if you have room for it. I'll let Warby comment on that skill with his Glad experience, I just don't know enough about it.
5. Acc. food is your friend. Bring it with you wherever you go and try to keep your elemental affinity attuned for it to give max results. Again, it's another item that boosts the acc. stat directly which can help push you over the edge in terms of acc. instead of trying to max dex and suffering the diminishing returns.
6. Another skill that can server to improve your effectiveness in battle (this goes for most classes actually) is one that is often overlooked and underused. Thm's Initiation skill can be extremely useful if you have an extra one that isn't too busy spamming heals and debuffs. All too often I see people trying to be Mrd/Drk and using absorb skills in battle. Either they sacrifice points into piety, or they don't and fail miserably at every absorb attempt. The simple solution is to let the Thm absorb for you, then transfer the boosted stats to you. Try asking a Thm to hit you with Def/Acc (tanking) or Att/Acc buffs the next chance you get. You wont be disappointed I assure you.
7. With all these skills I've found my accuracy issues to be a thing of the past, Think about it.
With 100dex, +acc rings, +acc food, Hawk Eye, Disorient II, steadfast, Skill precision and the 4-7/8 person Party boost
you shouldn't be missing much either.
8. Another path you can consider would be leveling Thm and Con to at least rank 20. You will gain the use of cureII/sac II which can supplement Second Wind and bloodbath if you are in a pinch and need some hp. Just don't put stats into mind to try and boost your healing ability, it's a total waste. Mrd has piss poor magic skills to begin with so you would basically be multiplying 0 by some other number. But they still both generally heal for 250 each with regen as a bonus for Sacrifice.
Additionally, while leveling the magic classes you can farm their leves for guild marks and buy yourself the stat modification traits Complete Control I and II, Driven by Faith I and II and Will to Power I and II which add a combined 15 points into dex/vit/str each and respectively.
9. Marauder owns hardcore and should be worshiped by Eorzea as a whole. (Actually I've just run out of things to say at the moment but feel free to add any other ideas you've come up with, I'll add to this later if I think of any other tricks/tips I've come up with)