Here is helpful chart
Your first idea will end up very bitter and medium gravity. Second would end up fairly high gravity with a less apparent bitterness. Those are some high alpha hops.
Third recipe is with half ounce at 60 minutes and ends up just on the slightly hoppy side.
Style: Generic Ale
Batch: 5.00 galExtract
Characteristics
---------------
Recipe Gravity: 1.057 OG
Recipe Bitterness: 55 IBU
Recipe Color: 7° SRM
Estimated FG: 1.014
Alcohol by Volume: 5.5%
Alcohol by Weight: 4.3%
Ingredients
-----------
Dried Malt Extract, Light 3.00 lb, , extract
Liquid Malt Extract, Light 4.00 lb, , extract
Generic 1.00 oz, Pellet, 1 minutes
Generic 1.00 oz, Pellet, 60 minutes
-------------------------------------------------------------------------
With 5 pounds it would be this;
Style: Generic Ale
Batch: 5.00 galExtract
Characteristics
---------------
Recipe Gravity: 1.075 OG
Recipe Bitterness: 51 IBU
Recipe Color: 10° SRM
Estimated FG: 1.019
Alcohol by Volume: 7.2%
Alcohol by Weight: 5.7%
Ingredients
-----------
Dried Malt Extract, Light 5.00 lb, , extract
Liquid Malt Extract, Light 4.00 lb, , extract
Generic 1.00 oz, Pellet, 60 minutes
Generic 1.00 oz, Pellet, 1 minutes
________________________________________________________
Style: Generic Ale
Batch: 5.00 galExtract
Characteristics
---------------
Recipe Gravity: 1.057 OG
Recipe Bitterness: 29 IBU
Recipe Color: 7° SRM
Estimated FG: 1.014
Alcohol by Volume: 5.5%
Alcohol by Weight: 4.3%
Ingredients
-----------
Dried Malt Extract, Light 3.00 lb, , extract
Liquid Malt Extract, Light 4.00 lb, , extract
Generic 0.50 oz, Pellet, 60 minutes
Generic 1.00 oz, Pellet, 1 minutes