Here is a pretty rough gauge (off the top of my head) of what to expect from adding certain components to your 1-1 pressing (assuming you are pretty efficient at the transition i.e. climbing from the 2nd to the 5th girder). These scores only really apply if they are added in this order too, as the amount of time allowed for grouping up top and leeching the fireball/grouping on the bottom can both be affected by how many hammers you grab -as well as they both can affect each other .
Running the board: 3,500-4,500 total
Adding the top hammer: 5,500-7,000 total
Adding the bottom hammer: 7,000-9,000 total
Adding grouping up top (before using the top hammer): 8,500-10,000
Adding Leeching the bottom fireball *a lot* (this includes on the second girder, when applicable) and/or pre-bottom hammer grouping: 9,500-11,000
Obviously, better luck than usual is needed for the higher scores... these are just estimates for your typical, almost 100% safe attempts. I'd actually say that if you can *consistently* get about 9,500-10,500 without dying then you're probably pretty much maxed out at 1-1 pace and you'll need to start employing riskier techniques (not play to survive) to get the bigger scores.
EDIT: The most important component to add in order to jump from an 11k score to like a 12k or 13k score is gonna be harassing the daylights out of the bottom fireball and leeching it on the 2nd girder while also jumping over barrels. Then, risking grabbing the bottom hammer in tight quarters at a time where you can at least smash 3 blue objects. Typically, with this method of over-pressing the bottom fireball, there actually won't be much time to group up top under Kong.