Hi we tried that The problem is that the three way point has frogs very close together. Being electro frogs its mostly metal. But supa gluing strips into the bottom of the frogs did not seem to fix the problem, however it did upset some SEM wheelsets which operated ok before. Supa gluing to the frogs just looked terrible and after trying three thickness of strips we improved the problem by ensuring the bogie actually derailed every time rather than just some of the time.
If Peco is the track standard for a hundred different reasons, mainly availability in all hobby shops, at least looking great if you use code 75 or 83, and relative price not to mention durability in use as well in track laying etc etc. as I said before I am staying with 110!
If the gluing of strips to the bottom of the frog did not solve the problem, the problem has nothing to do with wheel drop or wheel width. Now days you can get black styrene so there is no visual downside to this easy to do wheel drop solution for coarse scale frogs.
First check the wheel check gauge and back to back before assuming the wheel width is a problem. 88 wheels should have a back to back measurement of 14.4mm to 14.5mm for Peco track work. The SEM wheels that derailed were probably overgauge for the Peco 3 way turnout track.
If you insist on using small radius turnouts (600mm 24"), Peco slips and 3 way turnouts expect derailments from bogies fouling coupler boxes, and other parts of your models.
I have no problem with Peco code 75 turnouts and fine scale wheels because I check that my wheels are within the AMRA wheel and track standard limits and stick to the AMRA minimum radius standard. Thus I avoid the 3 way turnout, small radius turnouts and slips for my mainline locomotives and passenger carriages.