That is observant of you Kento, the Chilli does indeed have more foam removed from the deck nose section than my local custom. Its actually fairly pronounced by any standards. The apex of the nose rails were kept high despite the deck being lowered, so the board does not catch in turns. The weight of the foam removed must be tiny though. I prefer the volume distribution of my local custom and it catches waves a tad better, however that might be the rocker and maybe my individual preference. As a generalisation the Chilli is a high nose rocker/low tail rocker board, my local custom is the opposite. The Chilli is a better groveller whereas the local custom has a bit more performance and handles steeper/more powerful waves better.
I don't have all the answers with what makes boards work for me, my 2019 build went surprisingly badly despite seeming sensible on paper.
If you think a large part of why your latest custom doesn't work is the rails, then it is a good opportunity having your favourite boar in for repair at the factory to get a rail reference. That's not overdoing the customer input in my opinion, however you would know the situation best.