Very good first post . I just wonder what took you 10 years to get curious enough .
Anyway . You are the second lucky recipient of the new " 1st POST EXCELLENCE " Silver series award .
Well done and CONGRATS .

AZDOMINATOR:
Pretty informative. I had not noticed some of these things.
One question though. So on a perfectly flat surface a 30' meter at full power should send the ball 30' right? How fast do the greens have to be where they will make the putt go further? 10? 12?
I've had trouble on some greens where they were pretty flat so I used 50% on a 30' meter for a 15' putt and the ball ends up almost 15" past the hole! Trying to figure this out and it has to be the green speed. That was on a course with Tournament 12 green speed.
What speed will give your meter the truest speed? In other words a 15' putt is 50% on a 30' meter at what green speed? Anyone? Thanks for the help!
These tips below are not mine . But are the basics for as you inquired , 30' putts .
>^<>^<>^<
Black grid = Flat ~ Blue = Uphill ~ Red = Downhill
Yellow or brighter = PRAY! :-)
Below is for a 30 foot putt on black ie: flat greens.
Champ Speed (13 stimp) = 72% or 30% less power.
Tournament (12 stimp) = 74% or 25% less power
Fast (9 stimp) = 97% or 3% less power
Slow (7.4 stimp) = 113% or extra 15% power.
<*><*><*><*>
here's the formula for any green speed. in case you get a tourney
with 12.4 or 7.8 or whatever. you divide 10 by the green speed number
plus 1 for uphill, green speed number +2 for downhill. that is your
multiplier. for example on a 13 champ green it would be 10/14 = .714 .
multiply that number by your distance + elevation up. downhill on champ
13 is 10/15 = .667 x your distance - elevation down. this formula will
work for you if you need to figure out an unfamiliar green speed on the
fly. like those pesky bracket tourneys with 8.7 or 11.4 greens i
forget what all the standard slower ones ere i think 9 was just the
distance with no multiplier .but here's the magic numbers for the
common ones. these are all for uphill. for downhill just use the speed
for next tier.
10 very fast, .91????
11 tourney, .83
12 tourney, .77
13 champ, .71
14 champ .67
<"><"><"><">
Here are a few links to read up on . Vidoes , tutorials , meters , etc .
Tekoma's Putting Techniques vol.1
*vol.2 Tekoma's Putting Techniques
*Putting Tip: Distance Control
*Putting, its killing me (slowly)
*Putter precision tests - Now with irons!
StoneCold's Putting Clinic
Understanding Wind, Precision & Forgiveness
*Putting Math (not for the faint of heart)
*Putting by the Numbers - UPDATE*
AB's Putting Guide-My Secrets 2018 Update
https://youtu.be/lSeL3C2im20
https://sites.google.com/site/bilkosputterpal/jacobsgolfstats/wgt-putting-201-sck
WalkofLife
https://docs.google.com/spreadsheets/d/1WGAUu-a72sD8jmrSQKp5VNHDVhBqHxxIK1nDz1wmX5g/edit?usp=sharing
https://www.youtube.com/watch?v=4vEsKZ4M9T4&feature=youtu.be
https://www.youtube.com/channel/UCo9SVkHecqR5w7mkXKvjGrw/videos
WalkofLife Punch Chart
https://docs.google.com/spreadsheets/d/15Y9nipctR_jRHj2L-KWkFxN29oYAqBaIaLEmid__Lgo/edit?usp=sharing_eixpa_nl&ts=588468a7
MistressCosetteamazingblog
Need help with chipping distances
*DEM DAM DOTS DON'T DING
To Ding or Not To Ding...That IS the Question
Uneven lie tutorial