I will take pictures tomorrow when I have light and attach to this posting...

Trees from seeds will take years to produce. The fruit should improve in time. The suckers that get removed are mostly for grafted trees. The rootstock they are grafted to generally produce undesirable fruit and rob energy from the rest of the tree but since your is from seed that wouldn't be an issue. The seeds in your fruit may always be there due to it being grown from seed and not a selected seedless varity that is usually grafted to reproduce the trait. You didn't mention if you fertilize but fertilizing it may help to improve it. There are many topics on here on fertilizing. I'm am amazed that you get edible fruit from your trees. A lot do not produce tasty fruit that are grown from seed. Hopefully someone else will chime in, by no means am I an expert, and can give more or better advice. Otherwise, keep doing what your doing, your trees sound like they're happy.

And get those pictures on here I would enjoy seeing them. :)

I have seed grown tangerine, nagami kumquat and meiwa kumquat tree. I hope I don't have to wait 12 years. Mine however are in containers and are just over one year old. Its nice to hear from others that started their trees from seed. Most citrus trees grow true from seed. If the tree is stressed in any way they will put out a lot more seeds, So I agree on the importance of feeding it. Some citrus fruit with few seeds will produce a lot more seeds if that variety is cross pollinated with a different.

Schnell:

I know of two people who have orange trees like you describe. I know a lot more that have planted seed from supermarket oranges that have something else they can not eat.

I have a couple of grafted trees that give small sized oranges. But I wonder if your trees are truly "round oranges" or if they may be mandarin hybrids, like Fairchild, or Sunburst? I have seen a lot of people surprised to find out that Page and Satsumas for example, are not "oranges". If you have some mandarin variety, they may be as big as they can be. If you have some true orange, thinning and fertilizing may increase the size somewhat.

On the time to fruiting from seed, a general rule of thumb is the smaller the fruit the sooner seedling tree bears. But there are big differences in the results you can get. I planted a Rio Red GF in a really good soil with a fantastic mulch, and it fruited in only six years. I planted a Ray Ruby seedling near a giant pecan tree in heavy clay, and it is 13 years old and has not bloomed. Getting them to bear is a function of getting them to outgrow the immature wood. A lady once said she had a Keraji (small mandarin) that was 9 years old that did not bloom. Mine had fruit in four years because I had it in a good raised bed and it was well mulched..