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Delta-cod
you are right, this place is better for the post. Thanks for putting it here.
About your suggestions i'll commentate in what i know/have used:
Reverse Down-B and all in all DownB: is a GREAT out of shield tool, but i find it lackluster to use it against passive opponents, even when pressuring a shield. Any clever guy will try to roll across yoshi: yoshi has a TERRIBLE roll pressure, with his best coverage move being his dsmash (who has a short timed hitbox). Even his grab may whiff while covering all the roll trayectory.
If you try to downB a shield opponent, the best tool they will do is roll when they see you aproaching, or, shiled the first hit and roll before you drop. They will have enough time to Kill you with any smash. I have been stopping to use down b unless to counter attacks or engages running to shield. Against a defensive opponent it wont work.
Btw, is shield break after almost any attack, but only if the opponent is dumb enough to keep the shield on after taking the drop. The stars are the ones who cause the shield break, but there is a noticeable delay (small, but noticeable) between both hits. Leaving the shield will leave you unscathed.
Moreso, i have had experience and most times you can shield the stars too and make sure to leave the shield just after it, and the shield wont break. It will be at minimun, but it wont break. Dunno if it's any sort of shield drop buffer or that the most damage to the shield is from the time out. Really.
Anyway, if you get it, you can get a kill as early as 50, or less, by pushing the opponent to the nearest edge walking with yoshi at his side. I was trying to find you a vid where I did but it seems it haven't been uploaded.
I really don't advise using it against defensive opponents. Most of the time they will act accordingly. It's best to use it as a counter or as a pressure move.
Tip: Against a pressured opponent, jab poking to downb or grabs are greaaaat tools. Just don't try to do it against people playing neutral on the defensive.
About solutions i have thought to this problem...
I have been thinking about wavebounce heavily to pressure shields and try to fish for kills after they leave egg, although is not that sure, it seems like the best option.
Another option is to try to get into closer range doing empty jumps or trying to go for a tomahawk. Yet, if they roll to you the best response is none other than a nair oos, which is not very useful *sigh*, or try to fish for a down b. Will work on those.
PS: Forgot something. A lot of people will tell you that yoshi has no lag or their attacks are quick, and will try to show you what i have called the "crazy yoshi". That's just a Yoshi that will throw attacks all the time without any strategy, just trying to be a hitbox ball. This yoshi loses even more heavily against defensive opponents, but it destroys low skilled peoples harder, because you need to know how to play against yoshi. I heavily advise against it. In my opinion, is almost as playing a card game: most of the time it comes to luck (and only if your opponent is unprepared).