Can some one help me with my oven n firecrackers?

Ok let me say this I LOVE firecrackers but every time I make them it will either work very good or wont even get me high at all. I think this due to my old stupid old fashioned oven. As a reference this is the recipie I use for firecrackers.

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http://boards.cannabis.com/showthread.php?t=87246

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Anyways my oven does not have like a digital tempature thing to set it at. I have one of those ovens were you have to turn the knob to the tempature you want. So I have concluded that my stupid oven is why my firecrackers only work half the time because I cannot set the oven to exactly 320°. I either turn the knob to far and vape the weed or away or I dunno.. i just find it a hassle to cook firecrackers with this old school type of oven. I mean it does work but only if I get the temp right. So what should I do to always expect 100% success? I was thinking maybe if the recipie calls for 22 mins at 320°.. maybe I can set the oven to 300° instead and just cook it a little longer than 22 mins.. but heres the problem I dunno how much longer to cook it for.. or will the THC even be released into the peanut butter at 300°. Anyways plase answer my question if you can and I posted a pic of the temp knob of my oven to show u how hard it is to get it at 320°. ( I was a lil bored so I spiced up the pic in photoshop) Also 1 more important question I have. How long is it ok to keep firecrackers out in the air after you cook them? Like would I lose THC from the cracker if I want to store some firecrackers to take a few hours later?

sounds like u need to use the microwave

does the mircowave work and how long do i cook the crackers in the microwave?
but, i thought microwaving bud actually ruins some THC

my oven is old too. I'd like a time period for if I heat my crackers at 260-70. And if decarboxylation before would make it any more potent. Maybe even the grilled cheese and butter method would work if decarboxylated before?