Uth: So hard to win 8 in a row?

Table min is $15.
I only play ante + blind. (No side bets)
I press on every win.

My goal is to get to$100 bet because the cap for a Royal payout (500:1 odds) is $50k.
That takes 8 presses for me.

Winning 8 coin tosses on a row is 1:256.
It takes avg 510 tosses to win 8 in a row.
https://www.google.com/search?ie=UTF-8&client=ms-android-samsung-rvo1&source=android-browser&q=How+many+hours+will+it+take+to+have+heads+come+out+eight+times+in+a+row#lfId=ChxjMe

At 35hands/hr, it should only take 15 hrs for 510 hands.
I've played a couple hundred hrs of uth (both machine and hand dealt) over a decade and have only won 8 straight twice.
Why?

Small sample size or my math is wrong?
Or..?

Only advance on the progression when winning a 4X Play Bet.
Try doubling your base bet so you can get to max bet in 5 wins instead of 8. Or play at a $25K Max table and get to 5 wins from $15.
($15, $20, $30, $40, $50) or ($30, $40, $60, $80, $100)
Play at your max bet after 5 wins in a row until a loss, then go back to the lowest bet.

I played UTH a lot on a cellphone app and found that the most common result is winning 6 times in a row. I haven’t recorded how many times of continuous losing I’ve been experienced, but I feel I can easily lose 8 times in a ow.

Quote: ChumpChange

Only advance on the progression when winning a 4X Play Bet.
Try doubling your base bet so you can get to max bet in 5 wins instead of 8. Or play at a $25K Max table and get to 5 wins from $15.
($15, $20, $30, $40, $50) or ($30, $40, $60, $80, $100)
Play at your max bet after 5 wins in a row until a loss, then go back to the lowest bet.
link to original post

My goal is to hit the $100 bet mark starting at table minimum, not bankroll preservation.
It's enjoyment of the action.

Once i reach $100, i stay at $100 bet till i lose for the (VERY slight) chance of hitting the max Royal payout.
Then start over at min bet.