When I was in search of a call, I found that many small churches want a pastor with 5-10 years of experience. I remember being in a position where I was about to send my CV out to around 50 churches and had no expectation that any of them would call back. A friend of mine had similar struggles. He had 5 years of experience in a different denomination pre-seminary, graduated from WTS, faithfully served at the church he attended in Philly, did an internship at a flagship PCA church, was ordained as an assistant pastor, worked for that church for a year in a stop-gap role, and was turned down by quite a few small churches because of his lack of PCA experience.
Larger churches that have multiple pastors provide an opportunity for seminary graduates; it's easier for them to move into assistant or associate positions. Coming as the lone TE is difficult. Small churches should have high expectations for a pastor, but if you have a smaller congregation, I sometimes wonder how wise it is to demand a pastor with 5-10 years of experience. However, and again, this is only in my experience, those who care about small congregations are usually not men with 5-10 years in the PCA under their belt. So they become associates or assistants at bigger churches, and then gain connections that put them into medium-sized churches (or into church planting opportunities). The demand for this type of experience, in my estimation, can cause smaller churches to get "passed over".