How deep 3/8oz spinnerbait

Im not fanatical when it comes to spinnerbaits, but I do really well with them when I have the right conditions.  I feel like I might be able to pump a 3/8 in 10-12' with some efficiency.  If Im tryin to bottom trace in water deeper then 8' I think staying with 3/8 would hurt me more then help.  Even using 12 lb FC, inner layer skirt trimmed and a twin straight tail as a trailer that 3/8, Im still going to have make considerable effort to keep that bait from rising on the last half of the cast.  I could use a 5/8 and just slow down a bit and drop my rod tip as I work the bait closer.