big head driver help, no offset ?

[Blueman]

Been using an older snake eyes 10* driver and have learned to hit that one pretty straight. The head on it is pretty small, looks about the size of an old hickory 3 wood. It is also not a Ti driver. Has a lower pitch than a Ti.

So wifey picked me up a 400cc driver at a garage sale the other day and I was like, man is this going to be easy to hit.

Hopped the fence and 1st hit went 280 right down the middle with a light swing. Since then it has been all slice. I did manage to get 1 more straight shot out of it and then hit my snake eyes. The Ti gets me about 15 yds. further(golf coarse markers) but right now with the slice, it aint worth the risk.

I found 1 thing I was doing wrong with it as I was crossing the plane which seems to be my biggest enemy on all clubs. I corrected this and it looks like I am square but am still slicing it.

I noticed the 400cc seems to be perfectly parallel with the shaft as opposed to my snake eyes which is slightly past. Am thinking the snake eyes is "closed" and the big 400 is open or neutral. What is the correction to rid the slice ? Close the head a little so it is more like the snake eyes ? Any other things to look at and consider ?

And yes, I need a better swing.