Momentum design with strip and slot

Hello all!

I am newbie in designs with Momentum (ADS 2009) and I have some doubts about this software. I'm trying to build a power divider and I have a first design with strips. The results are good with Momentum but very difference if I use EMDS (with a difference of 15 dB in some S-parameters aprox.). My goal is to export this design to CST in order to obtain more precise results by simulating previously a coarse model in Momentum, but EMDS does not predict good results, so ... Is there any recommendation in order to prepare a simulation when EMDS is used?

I designed a slot version from the strip version (using coplanar ports) using the same substrate (and defining slots). The results are very very different (and very bad) using the same configuration and options with this slot design. Is this normal for similar designs using slots and strips?

Thank you in advance

I have not used EMDS but Momentum results in most cases are consistent with measured results. (of course if right port settings and mesh are set up)
Do not use slots; in most cases their response is not accurate because metal thickness is not taken into account.