Ivan, S51DI, is one of a handful of FM stations I've worked on 4M.
It's usually after working him on SSB.
Of the 130, FM, QSOs I've ever had just under a third are over 1000km.
The vast majority used horizontally polarised Yagis.
It's just a small percentage of the overall 3331 QSOs on 4M.
Best DX, on FM is OH5LID, at 2106km, as opposed to 3042km, SV5BYR, on SSB.
Greece aren't allowed FM so no chance of a contact, on that mode, there.
If Poland are only going to have 200khz, and bearing in mind that, when the band is busy at least 70.100 - 70.250 can be fully occupied with SSB, and 70.270 is the MGM activity centre there could be problems, with FM.
Because of the varied allocations FM QSOs between certain combinations of countries are not possible without split frequency working.
Something not commonly found on ex PMR equipment.
If all countries, eventually, get the same allocation, many of the problems will go away but, until then, a lot of thought has to go into operating procedures to get the best out of the band.
I've found the the best monitoring strategy is to use the SDR to monitor the whole band and leave the main RX on 70.200 with the sub RX on a frequency determined by suspected band conditions.
I don't monitor any FM channels.
If one shows up on the SDR I'll have a quick look but I've always found indications of good conditions show up through beacons, and SSB signals, before FM.
50MHz, and above, from IO83lb