A 233 step 1 score will get you interviews just about everywhere you apply in anesthesia as long as the rest of your application is good, so unless the competition ramps up even more this year, you should be fine with a 233 step 1.
As for taking step 2 ck and releasing it selectively to certain places, I'm not sure that ERAS will let you do that, so double check. When I released my step 2 ck score (after I had already released my step 1 score), the step 2 ck score automatically went to all the programs to which I had applied. Again, you may be able to selectively release your scores; I'm just not sure.
If you are going to try to do what I suggested above about seeing your step 2 ck score first and then releasing the score, be sure that your ERAS application (with released step 1 score) has been sent out to all of your program choices before your step 2 ck score is reported back to you; otherwise, if your step 2 score comes back before you have sent out your step 1 score on ERAS, I believe you will have no choice but to release your step 2 ck score along with your step 1 score. In other words, here is the timeline you could use. Submit ERAS application and release your step 1 score but do not choose the auto release of your step 2 ck score. Take step 2 shortly after submitting your ERAS application. Within about 4 weeks, your step 2 score will be back, and you can choose to release it or not.
Consider having your ERAS app go out on the first possible day it opens. That way you can go ahead and take step 2 ck and have the scores back before a lot of people even get their apps submitted by ERAS (trust me...tons of people delay sending out their apps for all sorts of procrastinating reasons). As I said before, though, you will still be getting invites to most places just based off of your step 1 score (since the vast majority of places don't require step 2) as long as your recs and transcript are good, so you don't have to worry too much about just how quickly your step 2 ck score comes back except for a very small number of programs.
I wouldn't recommend this option, but you could take step 2 ck a week or so before ERAS opens and possibly still get your ERAS app out prior to your step 2 ck score coming back (pray that you don't get delayed sending out ERAS).
One last suggestion...get your rec letters early. Go ahead and write your personal statement as soon as possible and get it to your letter writers early. Since you have chosen your field already, there is no reason to delay. So many people get delayed having a complete application with a particular program, because of letter writers taking their time. You will be amazed at how much Docs can drag their feet when it comes to writing you a great letter of rec.