From your description, it sounds like you have nothing to lose and a lot to gain by starting from scratch.
Like I mentioned, above, I seal the wood surface before pouring resin. This solved a lot of problems, back in the day when I'd buy my 50-50 resins by the five gallon bucket.
I discovered, very quickly, air would get trapped in the wood cells, then wait to ambush me when the resin was setting and the air could move out quickly, even under the supervision of a torch.
Some of the good news is, a lot of that epoxy probably soaked in and will help solve such problems.