You might be interested in this website: https://tophonetics.com/ It allows you to quickly transcribe entire paragraphs into the IPA, using either British or American English, and with optional weak forms in connected speech. For a paper resource, I like the Longman Pronunciation Dictionary: http://www.pearsonlongman.com/dictionaries/LPD/ it's a bit UK-centric, but it does a fairly good job of showing different regional pronunciations, and often has preference polls for alternate pronunciations. It comes with a computer program that gives you screens that look like this: https://dl.pearson.co.jp/resources/9781405881180/search/Longman-Pronunciation-Dictionary/LPD04.jpg

Dictionaries use broad phonetic transcription because the dictionaries are intended for the general public. The Oxford Learner's Dictionaries are excellent and give both British and English pronunciations. The recordings are by native speakers. fast https://www.oxfordlearnersdictionaries.com/definition/english/fast_1?q=fast fast adjective BrE /fɑːst/ ; NAmE /fæst/

use the dictionaries published before 1950 around that date CIA figured out foreigners were speaking too good English and created several phonetic systems to confuse learners

Please give examples. It is likely that the dictionaries are either noting British/American differences or that they are using "modified" IPA for better understanding by non-linguists.

What do you mean "precise phonetic transcription"? Most dictionaries provide the pronunciation using the international phonetic alphabet.