Just an Aspx, stripped down to d modules with exception of 5a Frameshift, 3a fuel scoop, 3a field maintenance. Have 32t cargo and planetary buggy. Adv. Scanner for exploration. Its getting max 34ly a jump which suits me.
Looking at galaxy chart more like 20k to get back to where I begun but heyho!
Purely for long term exploration :
1) Make sure your power plant is A rated(3A, 4A or 5A. I have 3A) , the heat mechanics on A is exceptional
2) Biggest Fuel scoop is a must !!!
3) Get rid of your cargo racks, why do you need them ?
4) My(nearly) build for Distant Worlds 2 :
ASP E DW2 BUILD
Why nearly ? because I am using it for Guardians so I needed racks. I will replace one cargo rack with an AFMU,the other I will wait and see in Q4 what FD is giving exploration(maybe the Guardian Booster?).
Why 2 SRVs ? You would know if you went on DW1
p.s. I love boosting,but if not, you can go lower on P Dist and Thrusters for more jump range.