My honest first impressions, take 'em or leave 'em:
- Very professional branding and presentation, and good amount of content.
- I didn't find the intro bumper WAY too long but I agree it could be trimmed.
- Asking for likes and subscribers before they've even been introduced doesn't make sense.
- You will likely find much better retention by doing at the dialogue intro before your bumper.
- Watch your enunciation. I likely only noticed this because I, too, mumble and have sub-bar audio, and I know in combination they really hurt.
- You might find some good tutorials on taking beauty shots of food for your thumbnails. I think some more dynamic lighting, open aperatures and lower/closer shots would make them look much more appetizing and professional. Add in some channel branding and you're golden.
- Trailer is pretty enough but doesn't really convey what the channel is LIKE (only what it's ABOUT). It has no personality because you're nowhere in it, and it doesn't include any clips from any of your videos so it doesn't really represent your unique brand. Instead it looks like a TV commercial for a grocery store. I suspect if you could merge a more personal, filmed trailer with some of the motion graphics you have it would do more for appealing to new subscribers.
Do you know why some of your new videos are getting less views? I'm not suggesting it's anything you could change, just genuinely curious as it's hard as a non-foodie to tell why.
Good luck with the channel - seems like you're doing pretty dang well all things considered!