The float function should rarely be needed. Any numeric operation that has a floating point number as one of its operands will be a floating point operation and return a floating point result. The trig functions all return floating point numbers. Floating point numbers have the equivalent of somewhere between 15 and 16 significant decimal figures, and you should only need 11 to calculate the circumference of the equator to the nearest millimeter.
If you aren’t getting that kind of precision in Panorama X, when you were getting it in Panorama 6, it probably means that numbers are being converted to text at some point. When Panorama 6 did that, it kept 15 significant figures by default. Panorama X keeps 6.