A bigger Gorillapod may help a little, but it probably won’t fully solve the problem. From the answers, the main source of shake is often not the weight rating itself, but how securely the Gorillapod is attached and how stable the support is. If it’s wrapped around a pole, branch, or rail in a less-than-ideal way, it can still vibrate after you press the shutter.

Also, tripod ratings don’t directly translate to better stability for every setup. Balance matters too: a longer or front-heavy lens can be less stable even if the total weight is within spec.

The most effective improvement is to avoid touching the camera at exposure time. A remote release is better than pressing the shutter, and a timer helps for the same reason. In calm conditions, a 2-second delay may be enough; in wind or with a less secure mounting point, even 10 seconds or a sturdier support may be needed.

So: upgrading may bring marginal improvement, but a remote release and a more rigid support/setup are more likely to make a noticeable difference. For windy outdoor use, a regular tripod will usually work better.