First of all, dead spots aren't exactly the end of the world. I hate them, and I know what you mean, but don't worry about it too much. (If you do, you'll have a hard time playing ret anyway - the rotation has a wait at the same location.)
Don't forget you still have procs to consider (don't use them immediatly, use them to fill in gaps), hammer of Justice can be put in there too, and finally remember that haste reduces the wait.
Originally Posted by Kahmal
...there is no true progression for a casual anymore, just hand outs.
Bare in mind that the boss rotation is meant to do the most dps possible and thereby will try to reduce dead-spots as you called them. Even on bosses ret paladins have them where you simply have nothing proccing and there's just nothing else to do. This has been a major complaint for ret paladins for several patches now. Unfortunately it comes with the spec as of right now.
There are a few things you can do to try to reduce them since in soloing it doesn't matter as much. Firstly use divine protection it's on a short cooldown and will help you solo things anyway. Tossing it out as a filler will help every couple of pulls. Secondly as was already mentioned use hammer of justice. You can also use wings and hammer of wrath on one pull. On the next use zealotry (save the 3 holy power or the DP proc from the last pull). If you do toss down a consecrate be sure to use divine plea, if it's not up don't use consecrate. You can also consider using seal of insight and laying down consecrate if you just want to get rid of dead spots. It'll keep your mana up pretty well even through using consecrate if you're only doing it once every other pull or so. The mobs are probably dying so fast that you aren't getting much benefit of the 5 stacks of seal of truth anyway.
Ive always felt that stopping your swing and casting (glyphed) exorcism is a dps gain vs just swinging away and doing nothing. Its a little harder on mana, but then again I never use Consecration. So unless I have alot of procs happening to where I cant judgement at all, I usually dont have a issue.
To the op . Do not use Consecrate on normal mobs. Its a Mana hog and even in a 5 min boss fight you not dropping many of them at all, just a filler, and a better than a hard cast Exo even tho it more mana , its instant , and when you do get your 2pc t13 you will find that your "idle" time is almost nothing.
And really you forget that you have "other" abilities that you should be using too on normal mobs , like Hammer of Justice and Rebuke which you should learn to use and perfect your timing on normal mobs. a 6 second stun is a very good thing.