I would get a bike you can commute in more often. I was doing a 40 mile round trip 2-3 times a week. Bought a Ti charge plug, it was awesome. Actually like the cliche magic carpet ride- 42mm tyres and ti and SRAM rival 1*11 which was silent. Had my fastest time on my road bike which is a not too fancy but not bad Vitus, knocking ten mins off at just under the hour, flat out, tail wind and the lights all in my favour and the legs were up for it, hobbled home of course. Ended up getting a fully mud guarded and racked ebike. Still flat out on the flats but it dragged me home head wind or not. Did this 4 times a week, lost loads of weight and fitness went skyward. It also meant I could enjoy a Sunday ride not feeling too battered. Ebike riding also stops you racing in, taking daft chances and calms you down a bit, which in traffic is a good thing.
If you don’t fancy the ebike thing- stick the fatest GPS 5000 you can on the fast bike with latex tubes, real world difference for not stupid money. Maybe get a fancy seat post with extra flex in it, and thick bar tape, or just chill and take the comfy bike also with the GPS tyres and latex.