The front center seems long, which isn't bad by itself, but if your top tube is only 1 cm longer but your front center is 8 cm longer... it implies an extremely shallow head tube angle or a very high fork rake (or both). One or the other won't determine stability/agility (both together will determine stability/agility).

I'd check and make sure the head tube angle and fork rake are semi-standard (since they'll both need to be semi-standard to work properly). Although unusual designs work it's harder to get forks that don't have, say, a 43-45mm rake for example.

If you run shorter stems (100-110mm) you may want to think about getting a slightly shorter top tube to get more weight on the front wheel. I suppose I lean towards one side of the spectrum but I prefer a 120mm stem (with normal bars, which means 130mm or more with a compact drop bar) in order to get good weight on the front tire.

As far as long wheelbase, my two custom frames, with very very short seat tubes (40 cm, compact style, so about 50 cm for a traditional shape frame), have over 100 cm wheelbases. This is due to the 56.5 cm top tube lengths (and 73 head tube angle with 43mm rake fork).