I admit, eggwars is fairly boring, being good at any game does make it boring. I think a few of BedWars concepts may be good for CubeCraft. No I am not talking about items but concepts.
Balancing:
The difference of the worst geared person compared to the best geared person in eggwars is massive. I think if the gap were smaller or the price for iron/diamond armor was higher it could be more fun. It would be a challenge to get overpowered gear, rather than the normal grind to get 32 diamonds for armor and sword and whatnot. Also diamond generators costing more to upgrade would slow down campers drastically.
The Punch Bow:
It has to go... Spamming with a punch bowl takes hardly any skill but is very effective against everyone no matter their armor. Yes while one that also has power lives in BedWars, it is very expensive in there and the islands are fairly close not to mention it is 1.8 PVP which in itself nerds bow spamming. Removing it will limit the amount of campers which make games shorter and less grindy for enderpearls.
EnderPearls:
What you just said the punch bow bad? Well if that happens the Pearl can go too. They are only intended for dealing with campers and removing the punch bow would fix that. Now they would be for island hopping which is equally boring.
Rarer Tokens:
Something that BedWars has that would make eggwars cooler is have the token generators be slower but be worth more to balance it out. This would save inventory space but mostly make the competition for diamonds more interesting since there are fewer.
Tnt Jumping:
Would add a new fun thing to do.