Rodinal @ 1+100 vs Rodinal Special

I'm a hugh fan of Rodinal 1 + 100 and Agfa APX 400 (I know grainey but _sharp and tonal and compensating_). I'm traveling and intended to process my negs so as to not avoid the airport X-rays blues. I have 20 rolls to do so today I went out to buy developer...No Rodinal to be found...Rodinal Special but none of my favorite old standby developer. Has anyone used the Special? How does it compare? I see problems as I shot my APX at 250 (standard Rodinal 1+100 ISO). The Special calls for 4.5 minutes @ 1+15 @ 20 degrees when shot @ 400...250 will probably mean what? 3.75? Seems like big problems to me...what should I do? Has anyone really diluted this stuff down to 1 + 50 or so? Or should I just fly in some ordinard Rodinal. Thanks

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