Blake
If you don't mind me asking what's your killing / helicopter exploding method?
I haven't got 100% in my game but I have all 100 packages and vigilante complete so I have armour, ammo and especially rockets and six bribes at my hideouts. If I haven't done paramedic yet but having health at the hideout would obviously help things more.
What I do is stock up on rockets - a couple hundred. Curiously. you only get 20 rockets per pickup in Shoreside Vale but 50 per pickup in Staunton Island.
Anyway, stand on the grass outside the entrance to your Shoreside Vale hideout. You should be between the bribes and the door. Aim rockets towards the street so they hit the barrier on the far side. Not towards where you drive into your hideout, but to to the right of your garage and to the left of the tree. There's usually a bunch of people strolling around so you can get a few kills per rocket. Sometimes if you aim the rocket launcher away and aim back people will be respawning faster. Your stars should rise pretty fast. You can also aim rockets at the wall in front of you to help prevent vigilant citizens and cops from jumping over and getting to you. Eventually you'll get cop cars, FBI cars, tanks and army trucks driving past so you can just keep launching rockets at them. The first police chopper that comes on 3 stars is no problem, just launch a rocket at him and he's gone. When you get to 6 stars, the helicopters have a tendency to hover right above your head so when you launch a rocket at them you lose 50 health/armor, so try to get them as soon as you hear them in the distance.
It's a good idea to clear your stars regularly, because sometimes when you're not looking, an FBI car or Barracks OL will get over the wall, come to a stop right beside you and you've got about 2 seconds before army/FBI get out and kill you. However, you're perfectly safe from tanks, I've yet to see one get over wall, they always get stuck. If you've just hit a helicopter, wait until your see or hear him crash before clearing your stars. If you clear your stars when he's veering out of control towards the ground, he'll just hover off and you won't register it in your stats.
Once you've cleared your stars, you can either save or just go into the hideout and hit CANCEL. This will replenish your supplies - bribes, weapon pickups. I save every 5 minutes or so using this method so all my kills will register on my criminal rating. Lather, rinse repeat.
KM.