Why seedbox finds seeds, my home connection dont

Not sure why ports are forwarded

Just a matter of peering. In the main there will be lots of seeds and leechers on a torrent.The fact you connect to different ones hardly matters. It is only when there is a couple that it shows. Had more than a few occasions when the opposite has been true. I cannot find a seed with my seedbox but my home connection can.

So is there a way to improve peering ?

Nope . It is what it is.

there was a torrent which i was trying to download at home , and home connection could not find it initially but later started dowloading at 100KB and when i started the seedbox the same torrent it started downloading at 20MB not sure how this works

Any ore feedback on this ?

http://wiki.vuze.com/w/Not_connected_to_any_seeds

This article describes a similar situation, and much of the explanation also applies to yours.