The double consonant in Italian is a linguistic signature of that language. Most singers whose mother tongue is English are aware of this, too much so, in fact. Italian natives laugh at our double consonants, so often overblown and overdone. The late and revered Fiora Contino had a recipe that served me well and I hope you. Aspetta, ballo, mamma, each have a single consonant and vowel before the double. Give that preceding consonant a slight impulse, and ever so slightly shorten the vowel following. Your double consonant—if you let it ride on that prior impulse— will have just the right weight. Bellissimo.