I recently read this handy-dandy Tofugu article about some general rules of thumb for rendaku, which has helped me a lot with intuitively assuming rendaku, greatly improving my Reading review items.
I also struggle with correct sokuon placement, and feel that there are some patterns, but I just can’t really lay my finger on them. I searched the Tofugu website, but alas, no article about it was present. A simple Google search also did not provide any good resources on this. Am I blind? Is no one brave enough to write about this? Is there just no pattern?
Any resources are appreciated
EDIT: I’m especially talking about those connective sokuon. Like you have しゅつ and はつ and it becomes しゅっぱつ.
Or きゃく and か and it becomes きゃっか.
I feel like this is something you’ll get the hang of. Generally speaking, it’ll happen when く is followed by a か-line character, or when つ is followed by… practically anything, really. Anything that’s not a vowel. つ likes to shrink.
Saying the words aloud, that actually kind of makes sense? The first syllable of the word “necklace” feels like it has a much stronger relative emphasis than the first syllable of “necktie” (which feels more like saying the words “neck” and “tie” on their own with roughly equal stress to me). I think the extra ッ in ネックレス does a pretty good job of conveying that stress on the syllable in a Japanese way.