I had a pair of Pike 454’s up until recently and had the same spring issue as I had an X-Firm and it was too hard. If you’re game for a bit of tinkering then you can actually fit the Sektor Coil to the pike although you have to move the top out spring from the spring side to the damper side. There are a number of forum posts online about the mod which I could probably dig up for you.
What coil do you have at the moment? If you undo the cap on the spring side then you can just lift out the spring and it’ll have a coloured mark on it. As standard it’ll be the red/medium spring.
Annoyingly, the ‘colours’ of the pike springs don’t exactly correlate with the colours of the Sektor spring, but I ended up on a Firm Sektor 150mm dual position spring in my Pike to give me 140mm of travel. I’m 79kg and it was perfect for me. I also tried a variety of other ones before I ended up at this one as randomly the springs came up on amazon for sub £20 so I stocked up on a range of them!