You are on the right track, but you need to make a few adjustments.
Track all games, if 2 or 3 numbers from a certain group hit, that group is generally NOT hit for 3-4 games. I mean if 2 numbers hit from 1-10, or 11-20, 21-30, and so on, such as the last game where 28 and 30 hit - which fall into the 21-30 category, USUALLY the next few games will not yield 2 numbers from the 21-30 group. I said USUALLY, I didn't say NEVER.
The next thing is look at each number that hits - how long has it been since that number hit last? Keep track, and you will notice there is a GREAT mix of the 'age' of numbers that hit, but few of you even consider that. YOU NEED TO. See for yourself and you will see what I see. That in itself may not help you pick the right numbers themselves, but it will steer you in the direction of picking better number sets.
And you can't help but notice how many times a number from the prior game hits, consider that also.
So lately, a good mix is to pick a number that hit in the last game OR THREE, a number that hit 3-5 games ago, another one that hit 7-9 games ago, a number that has not hit in 10-16 games, and then a 'wild card' - one that has not hit in 20+ games. Look for yourself.
And as someone else said, you have to pick 2 numbers from 1-30, and 3 numbers from 31-59 *OR* 3 numbers from 1-30 and 2 numbers from 31-59, that is where 72% of the winners come from.