I use Hydrofarms too! And I'm currently having the opposite issue with them, they aren't reaching the set temperature. Honestly I suspect it's just the cheap build of them, I've been reading some things about them failing after a few months of use and lots of other complaints. I'm planning on switching to a herpstat pretty soon, I would recommend that to you as well. More expensive than hydrofarm, but they last longer and you can plug in multiple heat pads (or in your case tape) to them and you can even choose different settings for each row.
You can o that already as long as you don't overload it
I also have hyrofarms that have been running several years without problems.