Why do you need to upgrade them?
I picked up some 2017 Pikes secondhand for a 650 build I did a while ago (Vitus Sentier – so 140mm travel around the front).
They were 130mm travel and I wanted 140mm so I went for a 2019 debonair spring assembly and just did a lower leg service at the same time.
They do the job fine for me on that bike – whilst not being quite as good as the 170mm Lyriks with rct3 charger 2 on my other bike. Although it’s hard to objectively compare with the travel difference and type of bike it’s on.
In terms of your options it’s the 2019 airspring / slicker ultimate seals / fancier charger damper option from RS. Or you can look at other aftermarket tuning options – I think fast might do an upgraded charger option or avalanche might do something.