Tomence is correct, I have always said for years now, to many profiles to choose from.
Find one that works all around and stick with it.
My favorite is either GCVP or Premium Cast Vinyl.
Now for your Metallic issue, obviously you have figured out that the profile must have the MT abbreviation next to the name, but also you need to select the correct print mode, basically telling the printer which inkset to use when printing that job (ie CMYKLcLmMT). Are you using the Roland Metallic color? You can also print the color swatchs for the Metallic table in VW. Click on Media/and selct which Metallic chart you want to print.
Make sure to set your default color settings in VW prior to running this palettes.
Edit/Queue A settings
I will provide my favorite settings and see if they work for you.
Quality Tab-For CMYK printing- GCVP Profile
For CMYK + Metallic- GCVP MT
For CMYK + White- Clear Static Cling MT
Choose your correct print mode from the MODE menu
Halftone- Select Error Difussion (v) (Note: works for most applications, sometimes lighter blues will appear grainy, if this happens just select DITHER)(( Use Dither if printing White))
Color Management- Sign & Display- Click Properties button and select perceptual in the raster dropdown, and put a check in Use embedded ICC profile bottom left--Click OK
Click on the File Format tab
EPS Margin: .005
Put a check in Spot Colors and Special Colors
Click on Printer Controls Tab
Media Feed Calibration- Select Use Printer Settings in dropdown
Heaters- Custom in drop down- Print 35-Dryer 50
Click OK
Let me know if these help you...been using these settings for customers for a year or so, usually works great!