A bit of a late reply but what other ESN/japanese rubbers are like Fastarc G1 (this hard or harder sponge) which are linear and not that catapulty?
I think Fastarc G1 and C1 are very very good rubbers, and I've also made a setup with G1/C1 for my friend I think 2 year ago, G1 on the FH and C1 on the BH... However, when we speak about G1, then for me it is too soft for the FH, and for the BH, I prefer a bit softer top-sheet, and faster, so I used rubbers like Vega Pro and X, and Omega 7 Pro, and now I wanted to try slightly harder sponge rubber on the BH - so using Rakza XX. Rakza XX sponge is a bit harder than G1, and the top-sheet is said to be the same as Rakza 7, very good grip, pimples not so close as Rakza X, higher throw, worse blocking than Rakza X, but more spin. It also doesn't feel very fast to me actually, but neither is G1 for me, it's not very catapulty for me... Anyway, I think Rakza XX could fit... Or not, hard to say...
Edit: I didn't have Dignics 05, but on paper the RXX could be considered the competitor... Also somehow I think they choose the name XX because in "dignics" you have "cs" on the end, spoken like "x", and Rakza XX there is 2 of them - you know, twice as much ... ;-)