The grabs come out slow, this is great, the moves have terrible ending lag when missed. This is questionable.
Maybe I'm just imagining things, but the lag after a missed grab is higher for Samus and Link than in Melee or 64. Why was it increased? I'm guessing to compensate for VBrawl's slower movement speed, to allow the whiffed grabs to be punished. Brawl+ has changed movement speed and smash attacks have been made easier to approach with using dash cancel. The increased dash speed has also decreased the advantage of high range grabs. The low range, low lag, standard grab can be compensated by faster dash speeds. Whiffed grabs should be punishable, but not by charged smash attacks. This is not a fair trade.
When I play as Lucas, and especially when I play as Yoshi, I don't grab. The very slight increase in grab range is NOT worth the slower execution of the grab and terrible ending lag for whiffed grabs. If players are avoiding a move altogether, you know there's a problem. Out of curiosity, what is Lucas's grab range compared to Dedede's?
Also with Yoshi, remember that he cannot jump out of shield, he has two defensive options when in shield, stop shielding and shield grab. When he can't effectively shield grab he loses all effective defensive options involving his shield.
I think you overestimate the advantage of increased grab range. Modifying the lag at the end of the grabs wouldn't make it any easier to grab others with these moves, it would just reduce the amount of punishment the tether grab can receive when failed to be more balanced.