perhaps that's the problem. overly meaty questions require overly meaty answers where email probably isn't the best medium. While you're thinking "why can't they just email me" the pastors are probably thinking "this person is not in a crisis and there is no problem for me to fix"
Rather than present a bunch of questions perhaps it would be better to introduce yourself in an email first and state your intentions and with whom you can have a conversation about some in-depth questions pertaining to core values and beliefs (without actually asking those questions). most of these churches (especially if they are a part of a greater denomination) have lengthy documents that spell all this out and is posted on their websites where you can figure out their positions by yourself or ask for these documents in the email which is a simple request.
think of the pastors receiving these emails... probably a lot of eye rolls. telling someone their position of once saved always saved really does little to nothing in building relationships, faith communities and edifying each other and the pastors are probably quite uninterested in the conversation. if you want an answer from a pastor who is interested in building someone's faith frame questions from the perspective of a personal faith crisis allowing the pastor to speak into you, have a relationship with you and build you up (because they are generally interested in that) you can infer the answer to your doctrinal questions by how they answer you (but this would only really work with one question).
You can try it as a test, ask a meaty complicated question to 5 churches then ask the same question reframed as a personal faith crisis to 5 other churches and see who emails you first. probably the latter because churches are interested in helping people not answering checklists.