First it's a misconception that Rodinal doesn't produce fine grain, it can if used carefully and in fact some of the best 35mm work I've seen was shot on APX100 processed in Rodinal. Ive used bot EFKE 25 & 50 (Adox CHS) with no grain.

However you have a combination of a high pH developer containg Hydroxide and emulsions that are quite soft and these films will surface suffer reticulate and give the appearance of greater grain if there's deviation in the temperatures during the processing, including washing.

You must beware of over exposure with EFKE films that causes increased grain and loss of sharpness. These a re single layer emulsions and have a bit less tolerance to under or over exposure.

Ian