Code:
Leather_Boots:
ID: 301
Data: 0
Amount: 1
XP: 50
Drop_Chance: 20.0
Drop_Level: 0
Max_Level: 1000
Drops_From:
Fishing: true
Leather_Helmet:
ID: 298
Data: 0
Amount: 1
XP: 50
Drop_Chance: 20.0
Drop_Level: 0
Max_Level: 1000
Drops_From:
Fishing: true
Wooden_Sword:
ID: 268
Data: 0
Amount: 1
XP: 50
Drop_Chance: 20.0
Drop_Level: 0
Max_Level: 1000
Drops_From:
Fishing: true
Wooden_Shovel:
ID: 269
Data: 0
Amount: 1
XP: 50
Drop_Chance: 20.0
Drop_Level: 0
Max_Level: 1000
Drops_From:
Fishing: true
Wooden_Pickaxe:
ID: 270
Data: 0
Amount: 1
XP: 50
Drop_Chance: 20.0
Drop_Level: 0
Max_Level: 1000
Drops_From:
Fishing: true
Wooden_Axe:
ID: 271
Data: 0
Amount: 1
XP: 50
Drop_Chance: 20.0
Drop_Level: 0
Max_Level: 1000
Drops_From:
Fishing: true
Wooden_Hoe:
ID: 290
Data: 0
Amount: 1
XP: 50
Drop_Chance: 20.0
Drop_Level: 0
Max_Level: 1000
Drops_From:
Fishing: true
Stone_Sword:
ID: 272
Data: 0
Amount: 1
XP: 75
Drop_Chance: 20.0
Drop_Level: 100
Max_Level: 1000
Drops_From:
Fishing: true
Stone_Axe:
ID: 275
Data: 0
Amount: 1
XP: 75
Drop_Chance: 20.0
Drop_Level: 100
Max_Level: 1000
Drops_From:
Fishing: true
Ender_Pearl:
ID: 368
Data: 0
Amount: 1
XP: 100
Drop_Chance: 5.0
Drop_Level: 200
Max_Level: 1000
Drops_From:
Fishing: true
Gold_Boots:
ID: 317
Data: 0
Amount: 1
XP: 120
Drop_Chance: 10.0
Drop_Level: 250
Max_Level: 1000
Drops_From:
Fishing: true
Gold_Helmet:
ID: 314
Data: 0
Amount: 1
XP: 120
Drop_Chance: 10.0
Drop_Level: 250
Max_Level: 1000
Drops_From:
Fishing: true
Record_5:
ID: 2260
Data: 0
Amount: 1
XP: 120
Drop_Chance: 2.0
Drop_Level: 300
Max_Level: 1000
Drops_From:
Fishing: true
Record_8:
ID: 2263
Data: 0
Amount: 1
XP: 120
Drop_Chance: 2.0
Drop_Level: 300
Max_Level: 1000
Drops_From:
Fishing: true
Record_10:
ID: 2265
Data: 0
Amount: 1
XP: 120
Drop_Chance: 2.0
Drop_Level: 300
Max_Level: 1000
Drops_From:
Fishing: true
Ink_Sac:
ID: 351
Data: 0
Amount: 1
XP: 120
Drop_Chance: 15.0
Drop_Level: 250
Max_Level: 1000
Drops_From:
Fishing: true
Diamonds:
ID: 264
Data: 0
Amount: 1
XP: 300
Drop_Chance: 0.5
Drop_Level: 900
Max_Level: 1000
Drops_From:
Fishing: true
Iron_Ingots:
ID: 265
Data: 0
Amount: 1
XP: 200
Drop_Chance: 10.0
Drop_Level: 400
Max_Level: 1000
Drops_From:
Fishing: true
Gold_Ingots:
ID: 266
Data: 0
Amount: 1
XP: 200
Drop_Chance: 10.0
Drop_Level: 500
Max_Level: 1000
Drops_From:
Fishing: true
Lapis_Lazuli:
ID: 351
Data: 4
Amount: 1
XP: 200
Drop_Chance: 5.0
Drop_Level: 500
Max_Level: 1000
Drops_From:
Fishing: true
Not sure how you got the 600, but that would probably be the McMMO wiki. Of course I would gladly lower it, maximize the fishing cap to 900 or even 1000. And if necessary would not mind to higher the amounts of experience of fishing.