You are doing something wrong. All the gaskets etc are compatible with the alcohol. Have been for decades. The ethanol is being blamed for a lot of problems and rightly so in many cases, but not carb gaskets and crossover tube seals. The alcohol race carbs use the same gaskets as you do, the difference is the needle and seat is steel as opposed to rubber tip and the accelerator pump gasket is different material.
It is common for the fuel bowl to 'leak' at the passage for the accelerator pump shot (that small hole running from the gasket flange of the bolw to the metering block), this can weep fuel while under pressure - just look at how small the gasket area around it is and you'll understand.
The leakage at the crossover tube seal can be prevented by using a little vasoline or petroleum jelly when you slide the tube into the gasket. It'll act as a sealant and make it easy to get the tube in there - true for either 'o' ring or condom type gaskets. Bye the way, if you have an 'o' ring type seal you cannot change to the condom type (or vice-versa) as the tubes are different lengths.
Hope this helps.