The simplest answer is to find better equipment especially by buying a Lv 200 Mag since that can boost your ATP and ATA well enough to let you get more EXP faster. But what starter equipment will help you get through this grind more quickly is what needs to be addressed. Some X/Battle unit like God/Battle or Heavenly/Battle can let you attack faster per attack. As for getting past the knock down problem, you're on the right track by using General/HP units, but consider buying Heavenly/HP units. I think that buying HP materials can help too, but it's more expensive for you at this point since you have more than one chatracter. I could also advise to get Heavenly/Power and Heavenly/Arm too, but I think your mag has your back on that for now. Maybe when you're in ultimate mode, will you need a lot more support in requiring more ATP and ATA, but I am going ahead of myself here.
As for getting better weapons, you can buy some yellow photon weapons with charge specials like Charge Arms, Charge Vulcan, Charge Partisan, Charge Ripper, Charge Laser, Charge Raygun, and Charge Slicer. They should be available for 1 Photon Drop (PD) for the kinds that have 50 Hit. What about your FOnewearl though? I would look for items that boost her techniques' effectiveness, so I'll leave
this reference for now since this post is already too long as it is.
If you insist on going at this grind by yourself, you may be better suited for quests with large amounts of enemies, which can help you find more useful items like grinders, materials, scape dolls, and even technique disks since bosses do take up some time. However, if you take my advice on getting some better equipment, the bosses will be much easier to defeat as you level up too.
So what special quests do I have in mind then? I would like to recommend
Rescue from Ragol because it is suited for players that want a lot of monsters to kill that are in the easiest parts of the game, namely Episode 1 Forest and Cave with the Dragon boss. It's also a custom quest that SEGA didn't develop, so expect this to be different than what SEGA anticipates players to run into. Some warnings that I need to mention though are that there are some traps that may instantly kill you in the quest, so bring some scape dolls. Another issue with this monster heavy quest is that you do have to bring scape dolls to stay in the quest; otherwise, you fail to complete the quest since the quest does not allow players to pipe back and forth to Ragol and Pioneer 2. Once you're in Ragol, you stay in Ragol until you complete the quest. In short, this quest has a few predictable pitfalls, but memorizing them shouldn't take more than 5 attempts to get the idea where to be in combat. I do want to spoil one aspect of the quest though, if you start in the first room of Cave 1, turn left and running into the empty doorway. It's not going to block you from entering even though there is no green door there. Just make sure to have a menu on your screen up because there are traps there to hit you if you slow down as you pass through the invisible corridor. Press the switch to skip the first room with monsters in Cave 1, and pass through the next green door.
I can keep recommending more quests, but I'll leave this
link for you to explore more quests. I guess I can point you towards doing more quests in the side story if you want to at least
do this, "
this, and
this" with
this video for "
this, and
this" mentioned since you're going to be busy for awhile. I should explain what "all this" is, but I'll say that completing those tasks will help you out later in the game when you're ready to do something like add %'s to some attribute on a weapon, adding a special attack to an
ES weapon, and adding Hit to weapons that are made from monster parts.
Oops, I meant to keep this short, but that didn't happen. Somehow, I remembered this clip when I read the question. No harm intended, but I thought it was humorous to link
this too while I was writing this up. Enjoy.
Edit: I forgot to say that using a
Ranger Wall for the RAmarl can help too since it adds 20 more ATA on top of your base ATA (ATA on the right) by adding it to the overall ATA (ATA on the left).