I have a similar problem and found a very nice solution. If you go to
www.nosepadking.com, you can do research on nose pads that you can
stick on to your plastic frames. These are not those little foam
stickies you refer to in your post. I have had great luck with these:
<
http://stores.nosepadking.com/-strse-71/silicone-adhesive-nose-pads/
Detail.bok>. I replace them every two-three weeks and have not had any
problems with slippage for daily normal use. Slippage still occurs
when I'm going for a run, but that's the case with any pair of
glasses, metal or plastic.
The
nosepadking.com site is a bit of a mess in terms of navigation.
They have a 30% off sale until the 27th as long as you use the promo
code: Thanks
BTW, if you are still not too crazy about ordering silicon nose pads,
you can go to
coastalcontacts.com and look for Gucci plastic frames.
They have a few with the adjustable nose pads. I have one of these
frames but still find that I am more comfortable with my regular
plastic frame and the silicon nose pads from the Nose Pad King for
some reason.
Good luck!
- Rory