Probably, if you're doing complex calculations with Forth that have many operands, you should favor left-reductions: reducing the stack should be as eager as possible. Don't pile all the operands into the stack all at once followed by a soup of words to decimate them. The code generation algorithm should be: whenever you write down an operand to be pushed into the stack, then if a reduction is thereby made possible, you should add the word to achieve that reduction.

HP programmable reverse Polish notation calculators have a typed variant of FORTH called RPL, which is in some ways similar to Lisp or PostScript:

https://en.wikipedia.org/wiki/RPL_(programming_language)