CASTING PYRAMID MOLD CONTINUED.......doing a pot melt while waiting for the right glass for my casting

Casting pyramid mold continued:
I decided to buy glass from Bullseye that is specifically made for clarity in casting.  In the cast of the pyramid mold that is Bullseye glass (frit) in the 1800 and 1900 series.  While I am waiting to receive that casting tint frit I am going to do a pot melt and then work on my tile saw as well as consider using my murrini mold. 

The first issue to consider for pot melts is how much glass to use and I am following this formula:
"To determine the amount of glass needed for a rectangular space, ..., measure the height, length, and width in centimeters of the space to be filled.  Multiply those numbers together and multiply the answer by 2.5.   This is the weight  in grams of the glass needed.  Using my 5 inch square former, if I would like a 2 layer glass piece which in 1/4 inch thick I would use 9.65 ounces of glass.  So right now in the kiln, I have approximately 16 ounces of glass, transparent amber, transparent green and yellow, along with white.  I am thinking of taking out all the white before firing tomorrow morning and seeing the weight after that.

I am also thinking about putting a clear square on the bottom or maybe I will just use some pieces of clear, enough to cover the bottom of the piece.  We shall see.

I took out the white, making it lighter, and place a clear square underneath the former.  For this pot melt, I will use the following firing schedule:

250 dph............................1000 degrees..................hold 15 mins
450 dph.............................1600 degrees.................hold 1 hour
Full....................................1450 degrees.................hold 15 mins
Full......................................900 degrees.................hold 2 hours
100 degrees..........................800 degrees................hold 15 mins
100 degrees..........................650 degrees................hold 15 mins
off

This is the resulting pot melt.

Certain parts of this look like the glass crackled from holding it too long .  Wait I am going to check on Glass tips, I think he just discussed this.  Next time I try holding at a lower temperature for longer i.e.
450 dph...............................1250 degrees...........................hold 1 hour
600dph.................................1500.......................................hold 2 houres