Trouble with Marth (grab questions)

[varus]

Hi, just to start out I'm pretty new to this game, so sorry in advance if this is a noobish question...
Well anyways, I understand peach pretty well, I did research and stuff ( regarding Peach tech like fc aerials djc etc etc and have a pretty good idea about whats good about her heh (down smash plox) in addition to basic tech skills as in dash dancing jc grabs/smashes l cancel etc) of course these things are not really close to being cemented in, but I just had a question about the Marth matchup: I can fare ok with it even though its campy and I don't like that, but at really early percents if the Marth gets a grab, he can just pummel, forward throw and dash re-grab... I've tried DIing all over the place, but I still can't escape it until the edge or higher percents. Sometimes I can air dodge out of it, but idk why.
This is just a guess, but to get out, do I just have to wiggle to get out of the tumble and nair or something?

 

[Sycorax]

Up until about 8% if you DI down and away and then buffer a spot dodge, Marth's grab will whiff if he goes for it instantly. Higher than that (still with DI down and away), I think you can just land and dsmash, tech if you're in tumble, or nair him if he goes for the regrab, depending on percents. If he's pummeling you below 40%, you should be able to break out before the throw with a good mash.