I'm not sure if this has been mentioned before, but I asked about this from fender europe service and this was their response: "The Panorama Tremolo System is designed to give you optimal results with 0.09 or 0.10 gauge strings. I have been advised that there are no plans to change the spring for this system.
If you wish to use higher gauge strings, you may wish to change the spring for a third party alternative. We've seen users successfully switch out to this spring here as an alternative -
https://www.ebay.co.uk/itm/274471519345 (TF Yellow - 16x8x25) when using heavier gauge strings. As this is not a Fender product we cannot guarantee that it will offer a perfect fit and may need to be modified. "
I also came aware if this issue few weeks ago when I was testing out 0.10-0.52 and 0.11-0.48 strings. It just bottoms out with very little room to play.
This of course isn't mentioned anywhere on their site, brochures etc. Even the aftermarket information on their site of panorama tremolo doesn't have any mention about this which is kinda sad. What is more pathetic is that they refer to this same spring hack which has been touted in youtube etc. Of course it doesn't even fit right out of the box, you either need to use washers or file down the excess material from the cone to make the spring fit properly.
I'm so pissed that I bought AmPro II instead of the AO. I can't remember the reason anymore which was the deciding factor two years ago, was that the AO was out of stock or I just didn't know enough from the AmPro, but with all the mods I've made so far, I should have gone straight with the 60s AO. This feels like a final nail in the coffin.