problem with relay?

[62 Bowtie]

any ideas as to why i keep blowin fuses is it becuz of fuse rateing? all wires are good no hot touching grnd. Heres what we got 8ga from batt to 87 terminal 0n 30amp relay 10ga from ign sw to pressure sw on tank 10ga from compressor to 30 on relay 8ga from other side of pressure sw to grnd on relay 10ga from neg on compressor to frame 10ga from relay to frame grnd hope this is clear also useing 25amp fuses one at the battery and one from ign wire thanks dudes