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@retrodicorsa
you shouldn't need to apply a lot of force if the upper race is not yet near the bearings (in fact you shouldn't need to apply force even if it was as this would overload the bearing). Options include:
1) The thread on the forks is different to thread of the upper race
2) Thread on fork not clean or obstructed by swarf/rust/crap
If the old headset top race goes on/off without excess force (still - try it now) then it would suggest no.1. If the old top race gets stuck now it would suggest no.2.
Excess force should not be required, and indeed is likely to permanently damage an Ultegra top race since it is alloy.