I'm positive that my average is well over 20lb over the past 18years on the big fish waters. On Nazeing from 2008-2018 I can recall only 4 fish below 20lb; 3 high doubles from Brackens and a 10lb mirror from Central Lagoon.
On Alton I did have a couple of doubles, both on snowman baits, a couple of 20's on pop-ups, one on a snowman and the rest of the 20's came on double 18mm bottom baits.
I was catching a lot of fish from the syndicate until August and the personal problems.
The syndicate has seen 20's and 30's caught on trimmed down 12mm pop-ups, 15mm pop-ups,, snowman baits and 15mm bottom baits, over just boilies and over particles, with only 3 doubles I think.
To me the base of the pop-up to the lakebed. Be aware though, that not every pop-up rig sits perfectly upright. The rig shown, I may need to trim down the pop-up, and with that balance weight, you need a buoyant bait to lift it to that angle.