I supposed that you were using perforated aluminium bar with dessicant. We were using that, too, but here is how it's done right now, and it works just perfect:

I use two kinds of interconnection material. For interconnection of the cells I use thin ones, wide around 2.5mm, and for interconnection of the rows and to get out of the panel I use wide ones, much thicker, around 7mm wide.

The butyl rubber is the one commonly used in windows production, double-adhesive one. I just use it to glue the 3x3mm rubber to the glass, and than I put bus bas between the butyl rubber and 3x3 rubber. After that, I put silicone (Sika Tack Drive) between the front and the back glass, to the top. I use 3x3mm rubber just as a spacer. In that rubber I drill two holes (2-3 mm) and apply the gas thrru one of them (lower ones when panel is standing upright) The upper one is just to let the air get out.

You can test the panels so that you heat them with something (or put them directly on the sunlight in summer) and after a while throw alot of cold water. Just like the beer in the summer, moisture allways appears on the hotter side (inside of the panel). The difference in the temperatures is very important.

I hope you could follow that. Glad to help if possible. Maybe I can give some detail pictures, but I'm away from home for two weeks.