Seconded. For starters, a good idea in fact is to take the pace off the first serve a tad to make more of them go in. Again, it's about playing to smart targets rather than going for 110%. Now here I come again with the annoying music parallels but this idea of going for your 70/80% shot that goes in 9/10 times is similar to what great live performers do. Just yesterday, bunch of us were discussing how great shredders like Paul Gilbert never look like they are having to work very hard to play the ridiculously difficult stuff that they do. That's because they only compose stuff that takes 70% of their ability to perform, giving themselves margin for the bad days. If they wrote stuff that would take 100% of their ability to perform, they would fail badly even if they were slightly off on the day. This isn't dissimilar to what pros do and is what recs should do as well. Don't hit your BEST serve unless, unless, maybe, when you are already 5-2 40-0 and can afford to chance your arm.If you're hitting 3 double faults in a row it is not the strongest part of your game. A lot of low level rec players have fast paced serves with no control. Great when it goes in. Else the oppoent knows a double fault is coming. Until you get your 2nd serve working well, you can't consider your serve as a very strong or the strongest part of your game.
This doesn't automatically mean the option is to just tap it in and pray hard that the other guy doesn't say thank you very much and hit the easy return winner (which, if he is a good player, he will do 9/10 times and force the error the 1 other time). Instead, hit your full swing but without pressing or forcing the RHS at all, just a nice, loose swing and swing to a target. Think whether you are going into him, down the T, wide, etc. For the second serve, maybe just toss a smidgen higher so you get spin going. That's unless you already have a good kick serve. I don't so I simply toss higher to get some spin on it.
Does it work? Well, today, in a nearly complete set with a player better than me, we had three breaks in all at 5-4, one each for both right at the beginning and the third (which I conceded) off a one point deuce at 4-4. I still made maybe four double faults in my four service games which is too many. But it's a lot better than DF-ing thrice in a row.
Speaking of which, another point to note: IF you are getting into a double fault spree, just STOP. Pause. Take a deep breath and relax. You ain't go no shot clocks in rec tennis and you most likely also don't bounce as many times as Nadal or Djokovic so you can 'cheat', take your time to serve.