I completely agree with you. As I've said, I consider myself a 'medium' high roller, meaning I rarely deposit more than $200 in a session, though will sometimes do that a couple times in one day. I nearly always stick with 9 line slots and will count the spins. Start at 45 cent or 90 cent and then up the wager if the hits are coming in frequently (every 5-10 spins) and if my balance is staying even or slowly increasing.
If my balance is dropping, then I switch to another game. If I don't hit the free spins within 50 spins (nearly always happens) I will switch to another one.
My recent wins are an anomaly to say the least. After 5 years of regular slots play (mostly microgaming), I really do believe that you will only hit these sorts of wins (multiple times) if you have a very large bankroll. I've turned $200 into $15,000 in a single session but of course I've lost a lot too.
More often, with all the bonus slots, I will fight to break the 1000 mark. If I do, it seems the wins are more frequent. If I don't make it, I tend to lose most or all of it.
I have been very lucky this week... and I know it's not going to last. I wouldn't advise anyone to try to chase it. If you go into it thinking you're going to win $10K from a $100 deposit, you're setting yourself up for big losses -- the odds are strongly against it. Set your goal to win $500 from a $100 and you have a better chance since one good bonus round at 1.25 could bring that result.