Congrats, OP, on having a sturdier exploration ship than most of the playerbase lol.
I’m sure by now in this thread, there’s been some good advice shared from seasoned explorers, but there's one thing I'd like to stress. Regarding ships that have undersized power plants to maximize range-- Make sure your power priorities are set! You can turn off non-essential modules until they're required for use, cycling others on-off in the process. I did just that on the lightest (read: terrible) T6 I could build, and it cost me 3,000ly of data because I wasn't paying attention.
My response to thread 'Exploding for no reason?', May 2019
The SRV hangar was one of those non-essential modules. You don't need them for flying through space, after all...
Simply switching that on caused my life support to shut off, so my ship exploded in orbit lol. Had I set my life support to a higher priority than literally anything else, I woulda been just fine. Could have been the SRV hangar, even. It wont kick you out when dismissing your ship, even if the hangar powers down when it leaves.
I've said it before, and I'll say it again-- nobody griefs explorers harder than they grief themselves. I am living proof. At least the other guys got to go out in a blaze of glory, crashing into a neutron, or making a new crater on a high G world. Me? pff.