Twitchy bike...

Ok I have a couple of Dolan PreCursas and on one of them I put a DF4 fork on that I had. The rake went from 35mm to 30mm so I suspected it'd would be more stable (as it has more trail). The bikes are the same aside from having different stems - 100mm on the stock PC and I think 120mm on the DF4 forked one.

In fact the bike feels a lot more twitchy than a stock Pre Cursa. Never really ride them back to back, but did the other day and they were worlds apart. Can't really fathom why, the only thing I can come up with the axle to crown length - on a stock fork Dolan say it's 360mm, and a DF4 fork is supposedly 300mm (I've not measured them). Would this affect the steering?

It's not a huge problem, just was curious why there was such a difference.

the axle to crown length - on a stock fork Dolan say it's 360mm, and a DF4 fork is supposedly 300mm (I've not measured them). Would this affect the steering?

A fork with a 300mm a2c will not accept a 700c wheel so something’s wrong.

If there is a difference in fork length it’ll be messing about with the headtube angle which could account for the difference in handling.

and different weight on front wheel because of stem length

Axle-crown measurement is the same when I checked it.
I wonder if the longer stem putting more weight on the front wheel makes it less stable then. I'm at the velodrome tomorrow so might try a shorter stem.