I'll throw my 2 cents into a number of characters who I regularly play against.
Jam: I would just like to mention that Robo-Dash is extremely effective (will always beat) against FB puffball. Try to bait it whenever you can. I know it's a little gimmicky and probably won't work too too often, but if youre full length screen you know you have the option of using it. Keep a sharp eye as the puffball comes out hella fast. If you keep the Jam player worried about robo dash all game, I think it's a pretty even matchup.
Sol Badguy: I personally don't think this is quite 50-50, but that's probably just because I lose to my (better) friend's Sol most of the time. Gunflame spam will keep you off your mat, and if you try to IAD over it Sol's usually waiting with a 5k > stupid air combo. 5p or 236S okizeme isn't generally safe as VV is stupid. Sol's 2d owns you and is great for pressuring you/keeping you off the mat. Sol's fast enough that if you jump and do air missles, he'll usually run under them and wait for you to fall and either 5k or command throw >dumb air combo. Robo Dash CAN go through an entire gunflame and CH Sol (or not if he FRCS it) for massive damage, However there generally isn't enough space inbetween you to get the 20 necessary frames or whatever of dashing to get it off. my advice is instant block like crazy and watch for any run up command throws of his.
Potemkin: Another match I'm not really convinced is 50-50, as he can keep you from gaining tension most of the time. Hammerfall >RoboDash, backdash-buster>dash. I rely heavily on spamming 6p and 2HS in this match and playing super defensively. Something also that wasn't mentioned is that when you block hammerfall, 2S is not safe because you can get Potemkin bustered out of it. I haven't tested all of the moves, but if you're hammerfalled in a corner, I think the best bet is to backdash as opposed to 5p, 2k, 2s, or whatever. 236S on ground is decent midscreen if you can get it off in anticipation of hammerfall. Lack of tension from mat via slidehead shenanigans +inability to instant block for bar (potemkin doesnt have terribly long block strings, and not to mention stupid command throw range) means you won't have much tension this match. 214S is good okizeme to bait buster, and if possible try to bait his backdash with a delayed robo dash. it has enough active frames to easily hit pot of of backdash if you time it sem-decently.