Absolutely without question definitely you should grow your FULL bush back.
Adult males with no pubic hair look like mutant teen-agers. Be a man, grow your pubes.
And don't worry that having pubes is going to make your dick look small. You're big, and appropriate pubic hair, like you were intended to have, isn't going to make that mushroom head suddenly look small. Can't be done.
And don't get yourself into trimming that little patch - somehow that's even more odd than totally bare.
Let 'em grow. You've got great assets, and they deserve to be shown in their real state.