onion question...

[DoubleSprig]

All along I have thought my onions were trucking along so good. They have their 7+ leaves and are pushing 2.5' tall, were they not bent over. Some already have scapes. The stalks of the plants are well over an inch thick and they are not really bulbing up on the onion itself. There is SOME thickening of the bulbs but not what you expect to see as an onion. I have always heard that each leaf = a layer of the onion itself, which is why I was thinking all is looking good!
Not sure the cultivars but I got purple and yellow onion "starts" from the local feed & seed store. Planted them out in the fall. They are much thicker than any of the ones i see in online pictures and videos.
First time trying onions, but the research I've done suggests growing them in sand/compost mixture. These are* growing in a raised bed, with excelent soil. "Bulbs" were planted about 1.25" deep, putting the growing tip about 1/4" below the soil surface.

I plan to leave them grow until they start dying out since they are doing "so well"....

no soil test done, all organic, mostly a mix of purchased unfertilized potting soils/compost/Black Kow/etc.

(I can get a picture shortly if anyone wants to see what I am talking about)


*lets hear some suggestions and ideas*

Questions are:

Did I plant them too deep?
Soil too rich or heavy causing top growth instead of bulb development?