Hi Baker, I use Bego investment. Tight fit may start from die, from wax, from burn out technique, from investment or metal. To my opinion, check your die stone expension first then check your water/powder ratio. You may add die spacer to loosing the fit. Check your metal expension too. For investment, water will do the trick to expension. More water>>>less expension and less water >>>more expension. I use both techniques fast and slow and follow strickly to manufacturer directions. Depend on its sizes I can add or reduce the number of wax paterns in 90gr ringless mould. Jensen Nobble metal I use giving me good result for my PFMs and that is all I can say to response to your question. I hope its help.
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