So... you are doing this everyday.....
"follow 50-100 <--- Why not 150? somedays 20? somedays rest? Somedays 120?
delay follow 30-45 <----- You think Twitter dont know how much time you take btw follows? And Its always 30-45 seconds? Uh, suspicious.
follow limit 1-5
unfollow after 3 days <---- Why after 3 days? why not after 2? after 5? after one week? 10 days?
unfollow limit 3-7
daily unfollow 55-110 <--- Dont unfollow more than 100 ppl per day, try to vary btw 25-89 ppl
delay unfollow 30-45 <-- same as I said before
like limit 3-9
daily like limit 25-88
delay like 33-44 "
The problem is your routine is easy, and you still asking why or how you get caught... ?
You have to act like a human, dont use only one setting. Have 5-10 settings and change it btw the days.
Why?
Because If you always use the same setting, always following the same amount of people, and you make always the same routine i'ts normal that you get caught...
Twitter is not stupid, they have a system, they know every action you do.
I recommend you also, dont use numbers 50, 55, 60, 65.
Use numbers like 51, 88, 32, 34.
I am a bot user since 2012 If im not wrong. And the important thing is that I never get caught... No one banned me never, not in social media, not in games, not in platforms of exchange... Nowhere. I think that in this point I'm a kind of Botter Master and there is my advice to you.
PS: You should be carefull this days because Twitter already know that you has been using automated tools. So you are on his vision... Rest some days, follow less people, unfollow less people... reduce your numbers for one month or
32 days 
.
When you use automated tools
you are always on risk to being banned or sanctioned. Im lucky, I guess.
As other user said above this post, you cant pretend to be inmortal because your account is aged. Start slowly and increase the numbers, then slowly again...
Have a good day.
