I think carrot may add to the sweetness, have you tried zucchini?

A mild winter squash might be good too (spaghetti type).
Or a not so mild one (butternut, acorn, pumpkin).
I think carrots would be good too though.
Try cutting the sugar by about 1/3 if it's too sweet.

Deanna

Decided on carrots---cause stuff was-sitting-on-countertop......It-turned-out-okay.Doubled-the-recipe all-but-the-blueberries......not-quite-doubled-sugar-
dripped-molasse-from-almost-empty-bottle-ito-it......Pretty-good-the-first-one-finished-yesterday
Wish-pecan-walnut,were-not-so-high----settled-on-almonds-
Love-the-crunch-of-nuts..
I-still-have-more-pumplkins.....
Got-one-sitting-cut-open-in-kitchen-now
Going-get-fat-from-eating-all-that-delicious---Pumpkin-gooey-cake......even-though-put-less-sugar,cream-cheese-than-called-for
Will try pumpkin next...
I-had-to-toss-out-three-pumpkins-cause-they-got-frozen-----and yucko---moldy....out-in-garage---
..It-bothered-me-to-do-so--but-cant-eat-liquid-slime-mold
Trying-to-compost-the- soft,bad-parts---but-so-much-to-deal-with-here-in-city-burb...
Thanks-all
Jean