Stunted peppers

[groshesa]

All of my peppers seem to be stunted in growth. They produce an appropriate quantity, but very small for all varieties (bell, banana, jalapeño, cayenne, etc.)
This is the second year with the same issue! The peppers are delicious, and cute, but a bell pepper ripens at 1/4 the expected size.
We fertilize with a homemade fish emulsion, I hand cultivate between plants, and mulch between rows with grass clippings. Also, composted chicken manure gets mixed in in fall. I'm theorizing that the earth packs too firm and the roots are stunted. My husband argues that with the cultivating, that shouldn't be a concern. We are in growing zone 4... Central Wisconsin.
Any advice is appreciated. :-)

[Molly Mckee]

Are the plants themselves stunted? Peppers don't like too much fertilizer. When my DH over did the manure and compost one year, our pepper plants were very large, with exceptionally large leaves and no peppers.

[groshesa]

The plants are small as well. It seems I double posted this question by mistake and others thought it may be a combination of the fertilizer and weather.
Thanks a ton!