Older post so, OP, I hope you did well in October! Hopefully my advice will help others.

I came to the forum to seek answers to this specific question. I am overall quite strong at RC and get nearly every question correct if it is asking me to identify something explicitly written in the passage. However, I am struggling a ton with Implied and Author's Attitude questions. I have found the 7Sage curriculum is lacking in its teaching of how to tackle these specific question types.

Here is what I have found helpful so far:

The author's attitude and, therefore, what their passage might imply is often VERY subtle. For instance, in one recent passage, the author's position on a topic came down to their use of the word "obviously." The author stated that the conclusions of some experts on a topic were "obviously" ignoring certain realities. It sounds like a strong statement out of context but within the wordy RC passage it's really easy to miss that one word and how it makes clear the author's stance. So I'm teaching myself to look for these subtle qualifying words. They are key.

While drilling/practicing, read some RC passages as if every question will be about the author's attitude. Forget about main point and passage style for a bit. Just focus on figuring out how the author FEELS. After you do this for a bit you'll begin to internalize this style of comprehension and you'll be better equipped to extrapolate from the information in the passage.