Where does the 100ft separation mentioned come from?
IFR departure climbing to 2400ft against a VFR flight not below 2300ft says to me that the VFR flight and the IFR flight could both be at 2400ft at some stage with those clearances.
The safest place for an IFR flight to be is in solid IMC. Less VFR traffic in there to worry about.
Yes I did say "less"!
Regards,
DFC