Yikes...my internet just died...sorry about that. Only just got it back up
:/
I'm not sure what advice I can give you to be honest. You seem to be doing ok atm. Just watch how I play and think 'How can I get around what he's using'?
I think punishing me more often would help. Take Bowsers Side B and Fair for example. I know that you're probably going to use one of the two when you're in the air. So what I do is jump out of the way of your attack and the punish you by hitting you back with an attack
Try applying that when fighting Peach. For example, if you think that Peach is going to try and Floating Dair you, jump up and hit her with an aerial. If you think that she will try to drop down with a Nair after Dairing your sheild, why not wait for the Nair and punish her with an OoS Fortress? If it looks like she's going to use her Fair, try to avoid it and then jump in and hit her with something
It's basically stuff like that. You know how to punish and stuff. Take Toad for example - you pretty much know when I'm going to use it and punish me pretty hard for that xD Don't always feel that you have to approach me. Wait for me to approach and then attack me back. Of course, that could be difficult because I have a projectile D:
And yea, the lag was definitly noticable. Why is bad unfortunetly because it means you have a harder time avoiding my Turnips. You could try sheilding them and OoS attacking my follow ups. Or you could try jumping and airdodge/catch them
Also, use your grab releases. If Bowser grabs Peach, Peach cannot escape unless she forces jump release. So, if you grab me and grab release me onto the ground, you can actually dash re grab me again and again until I mash enough buttons to make myself jump release into the air. And when done right, Bowser can hit Peach with a Fair when she is air released. If you ground release me, you can dash regrab me, Side B me or Jab/ F Tilt me. Use grab releases to your advtange
And if things aren't going too well...Side B me and try and drag me off the stage xD
If you think asking the Bowser boards for advice would help, I say go for it. The Peach Boards have definitly helped me on how to deal with match ups and stuff
Hope that helps
P.S Don't use Fire Breath for so long that it allows me to either Toad it or DI into you and hit you with something nasty like an Up Smash during your ending lag xD