You can increase the the travel on the rebas on the pro with the 120mm air shaft c£22 delivered from bike24 and it's a easy fit.
I see this year's pros are 1x and 120mm.
Can you link it?
One of these I think and select the 120mm
https://www.bike24.com/1.php?content=8;product=130915;menu=1000,2,121
Difficult to know for sure if yours can be adjusted by spacer (easy free) or you need the shaft. Depends which year fork halfords bulk purchased for these. I assume 14/15 spec so shaft.
I've serviced plenty of Rebas so ok to fit 
What tyre pressures you 2.3-2.4 650b people running?
I usually put 31-32psi in, tempted to drop that a touch but a little nervy of catching a flat off one of those stealth rocks.
Most of it has wiped/scrubbed off and having lubed everything up good and proper it all seems ok except the brakes need bleeding. Time to get some use out of the poor girl (and start storing it in the proper shed!)Popped into swinley this morning. Was the first use in "anger" for the patrol. She loves a berm
Think my monarch might be leaking though, seems to have a lot of gunk on the shaft?
Best go to the GUM clinic.

I've had that on the first couple of rides on a monarch, it'll settle down, as long as its holding air you'll be fine.
Were off to Samoens (just south of Morzine) Last week of July. 1st week August. Meet you there Begbie?

