I've realized that while I love my manuscript, the opening chapter is not as strong as it could be and I am significantly revising it. I believe that the new opening chapter is much stronger and is more likely to grab an agent's attention more so than the original.
I know you prefer not to be re-queried after a rejection, but do you believe that to be true for all agents, or is that a personal preference of yours? Most agents only ask for the first chapter and I believe that I may have better luck with the new first chapter. I have received 14 rejections so far. I've stopped querying for the time being until my revisions are complete.
If I had to answer yes or no and it had to apply to most of the re-queries I see, the answer is Yes. Most agents do not want to be requeried after a rejection.
This is because, most often, the book being queried isn't something I want to take on. I have personal preferences just like you do. Better writing isn't going to help. A better novel isn't going to help. I'm most likely never going to take on a novel about werewolves, shapeshifters or anything set in space. And no dinosuar erotica. Not now. Not ever. (I'm not making that up, I swear)
And there are those among the queriers out there who just requery endlessly for the same novel. Some years back there was a guy (he may still be out there for all I know) who queried the same novel something like 97 times. It was actually rather helpful that he did this: I learned how to do keyword search and block in my email so his stuff went straight to spam.
And that's the danger of querying too often no matter how many revisions you've made. If it seems that I've seen this query before, I'll look in my archives. If you've queried too many times (3+) on the same novel in a short period of time (months) I block your email address.
BUT for those writers who realized their work wasn't ready for the harsh light of the slushpile stage, and have made SUBSTANTIAL revisions, let me again say that there is no such thing as the Query Police. If you requery no one will come to your house and impound your keyboard. (This will change when I am Queen of the Known Universe.)
The trick is to also REDO YOUR QUERY. It's the query I will remember, not the pages. Use this information wisely cause the last thing you want to do is get yourself in the auto-spam folder. There's no way out of that short of changing your email address.