[Mike Haven]

i regret that i have no idea of the mathematics you wish to see, but, in general terms, you're going to pair roughly half of the time you take the flop, so, forgetting the times you play on without a pair, it's going to cost you 2bb for half your hands and 5.5bb for the other half

if you win 13.5bb for a cost of 7.5bb you need to win about half your completed hands to make a profit

loosely speaking, you would like to end up with a pair on the flop that will win close to 50% of the time against four "random" hands

playing any two tens or higher seems reasonable to me in the circumstances of the game you give