If you want a true frosty plant GDP probably shouldnt be your first choice as far as strains. I have three rules for maxing out frost levels..
1. First you absolutely have to make sure you have the best/correct genetics.. That is square one and the most important
2. You have to prune and prepare the plants correctly going into to flower and the first 3 weeks of flower. That is what sets them up for max coverage.
3. and the last and most important for the actual process of growing is imo.... Strong light/high ppfd
Rely less on (and some may argue w me but i dont care) what nutes you are putting into your plant and focus more on the process itself. I've noticed over the years that as long as you have the basic nute setup ratios you can rock ice shows with the correct amount of work and right strains. Sometimes I think alot of these bloom additives are BS but hey who knows