I use ibasso dc elite as it enhances everything with excellent technicalities, without adding a coloration. I also tried ibasso dc 04pro. But upper mid became too forward for my taste.
The Divinus Velvet Wide-bore ear tips are my new favorites for the Diva. I wear MS on the left and M on the right. They alleviate all the pressure-buildup issues I get with the stock Spinfit W1 ear tips.