Hi Nurseinob 5,
I asked a similiar question very recently"seasonal addition of compost".I received many helpful suggestions. I think I may add 'Soil Building Compost' by Miracle Gro. Supposedly it is supposed to be made up of 5 different composts. I may or may not also add some additional Mels Mix.
As to the strawberries: I have a raised bed of store bought compost only. (forget what brand). I found that it got very hard after the first couple of rains and I had to mix in a small amount of finer conpost with my fingers around the plants.. The original compost had an awful lot of forest products with a lot of twiggy material. Each spring I add some composted steer manure around the plants. (maybe about an inch). It seems to work quite well.
I think the rains cause it to procuce a compost tea kind of thing.
Other than the addition of the composted steer manure, I don't worry about adding anything to fill the shrinkage. Usually a strawberry bed is good for only 3 or 4 years then a person has to replant. So I just wait until then to bring the bed level up to manimum. You may be able to get more years out of your strawberry bed by removing the old plants and nutureing the off shoot plants. I am no way near an expert, but that seems to work for me. Ater a year or two you may be the expert to inform the rest of us. (So don't forget us) :-)

You don't really need to buy additional peat or vermiculite. Just supplement with compost. My strawberries have been growing undisturbed for 3 years, and they have spread.

Here is a link that might be useful: My garden blog

Well, keep in mind that compost will continue to de"compose" over time. Thats why you end up a few inches short by the end of the season. If your making your own compost, there is really no need to go out and buy peat moss or vermiculite anymore. Its worked for me now for 11 or 12 years....just keep filling up those squares and you will be a happy gardener...

Regarding the strawberries, simply add compost at the end of the season over the plants. Trust me, they will find their way back to the surface... and they will be much stronger for it!

nurseinob, Mel like many garden writer format their books like for beginners & seasoned gardener alike.
Once you have good soil, compost each year & soil test once every 4-5 years will be fine.
I planted leaf collards in the Fall 2010 & picked off them year around. I then made a new raised bed & turned in compost for more collards. The old collards are still producing, better then the new & had nothing but water for the last 12 months. If they are still doing good when the apples bloom, I will add compost.
But As the compost break down, it lifts up the soil making it richer. I skipped the compost because of time, but the old collards did not notice or complain( yellow leaves, slow to put on new leaves when I picked them to the bud).
I have picked collards on the 3rd of July, in 100 degree sun, for cooking on 4th of July.