Ok i finally finished the game, and got the 100% complete.
To beat the game you sometimes have to come up w/ strategies that are cheap and outside of the box ie) on a boat mission in south beach, i took a cigarrette gun boat from around the island and creeped up the gang's boat from behind and shot the hell out of it before the mission officially started.
So here some of my best tips for the game
1. get the limo so you can save time getting from one end of the city to the other when not in missions
2. when buying boats, the attack boat and cigarette gun boat are both great for combat or drug running
3. do a ton of cocaine distribution runs to build up money before you advance to south beach, because you end up needing a whole lot of money (200-300 million) for the investments
4 when you have a ton of money, buy your investments instead of unique items, because you get benefits from each of the investments
5. make sure you gang heat level is low anytime you are buying or selling coke, because you get better rates. Also, if your gang heat is too high you may not be able to buy or sell.
6. when in gang warfare, make sure you use your blind rage at appropriate times, or else you waste it
7. when you are able to buy the montana defense investment, do it, because you get to carry a 4th weapon w/ a whole lot more ammo for all weapons.
8. the Bacinari, the Rattler, and The Ariel HK I are the three fastest cars in the game, use those for doing the racing missions.
9. When doing the Drug Distribution missions, start off with no gang heat, and avoid accidents cuz your car's health is essential.
10 Your Laundering rate goes up w/ your reputation level, so when you buy the one investment (i beleive montana financial) you eliminate the bank's cut, which in turn saves you millions in long term.
any more questions, PM me or reply back
-JZ