Your assumption is correct Joe. It really doesn’t matter whether you pitch or flip,
because the underwater weed caverns cannot be seen from the boat. Most bass lie in the heaviest shade
of the weedbed, which is the myriad of shady nooks on the underside of the canopy.
Even so, I always wait for the punch rig to make bottom contact. There are 2 reasons for this:
>> Even though there might be less shade on the bottom, some bass are bottom-huggers
and those are often the biggest bass.
>> Bass lying at the underside of the plant crown will often follow the bait down to the bottom without striking,
where a bounce or two might coax a strike.
Most strikes occur during the "vertical freefall" to the bottom. On days when bass are especially active,
soft pumping in midwater around the the underside of the plant canopy can be very effective.
Punch weights can vary from 3/4 oz to 1-1/2 oz or more, depending on the plant species and density of growth.
In Florida's weedy lakes, the weight I use the most is 1-1/4 oz. In my opinion it’s better to be overweighted
than underweighted. Aside from better weed penetration, a faster sink rate tends to trigger more strikes on impulse.
On a final note, a common mistake made by anglers is to punch close to the weedline
without punching the inner mat. In an expansive weedbed, bass will lie a long cast away from the nearest weedline.
That is to say, you're still using short pitches and a vertical delivery, but your boat may be 25 yd inside the weedline.
Roger