Okay...here is how i stand on the infinites
DDD can infinite any time at any % under any circumstances (Besides moving platforms or stage hazards, most of which are banned in tournament anyway). Against those 6 characters, you are not allowed to get grabbed or it is an automatic stock. Against IC, you have to play smart, but you can separate nana. Once you separate her, the CG becomes impossible, and you can easily kill her and prevent it that stock. Lots of characters have moves that can easily separate them and therefore stop the chaingrab, and you can even do it from far. Also, things needed to make somebody's grab game good...ICs do not have. They have a slow running speed, are slidy if you hit their shield (So most likely they can't shield grab you) and they have a bad grab range. DDD has a great grab-range, doesn't slide, and although he has a slow run speed, he can make that up by just getting in their face and using his range to shut down their other options. Therefore, DDDs infinite should be banned and ICs shouldn't. DDD has proven to still be a great character without it, while IC suffers without their grab shenanigans.
Grab release infinites are a different issue however. I think that you aren't allowed to grab release infinite anybody passed 75%. Grab release CGs that you have to run in between the grabs are fine, because you can't just stand and do it forever. Grab release infinites are somewhat easy to do and one grab can equal death, much like DDDs grab infinites or ICs.
Also, the ledge-grab rule is perfect and i think should be implemented. Nick Riddle and I keep all the Florida CPs on. On norfair, if we aren't trying to camp, we only get like...20-25 ledge-grabs, on the level most susceptible to ledge-camping. The only way you will get close to 50 is if you are deliberately planking. People just ledge-stalling to get pressure away from them will only grab the ledge about 7 times...and i'm pretty sure you won't have to do it that many times to get a 50 grab limit. You also won't get hit off of the level that many times...so that isn't an issue
For the suicide moves, lower % wins, always. If you are winning, just because they killed themselves (with you) doesn't mean they should win. You should be able to mash out fast enough so they won't be able to kill you anyway, its not that hard.