That would not be following the
SLAM Process instructions I'd posted for you to read and follow. The TFP forefathers wrote em that way to avoid folks having unintended consequences from too-high FC which can fade liners, harm equipment, etc. And from wasting bleach...because the sun will burn off a percentage. If you add six gallons where you only needed 3, for example, 30-50% of that is just going to waste. Its better to add what you need to get a bit above the slam evel, then check again in a few hours and add more.
So out of an abundance of caution, I'd suggest staying below mustard Slam level when you overdose to keep at slam level for a few hours.
Regarding antifreeze, it would have come from the lines on opening a winterized pool if same was used and was not pumped to waste. Did you close yourself sat year, or did a pool co?
Regarding pucks, they will add to your CYA and make your normal operating ratio per [fc/cya][/FC/cya] more of a moving target. If you're actively trying to raise your cya, then it makes sense.
While TFP is all about knowing how to test and control your parameters, giving you the freedom to use whatever you want, most who subscribe to the TFP method avoid using pucks except for vacations. It keeps the testing and calcs simpler and helps ensure you're doing to the correct level/ratio for sanitation.
For each 10 ppm of FC you add by puck, you're adding 6 ppm cya.