102.7 last modified their license back in 1994 (a permit to modify was granted in 1993).
The public notice comment associated with this change was:
CP TO MAKE CHANGES: ERP: 28.0 KW (H&V), HAAT: 201 METERS
H&V, TL: 0.3 KM SE OF THE INTERSECTION OF COUNTY ROADS
29S AND 13W, NEAR PRAIRIETON, VIGO COUNTY, INDIANA.
So yes, they did change power, height and tower location since the 1980's.
In 1981 they did a power increase at the old site was to 50KW.
In 1978 they began operating at 33KW at the old location:
CP TO CHG SL/RC TO: 629 CHERRYSTREET, TERRE HAUTE, INDIANA;
CHG TPO & ERP: 33KW(H-V)
Most stations try to IMPROVE their coverage with changes. Moving from 33KW to 50KW on the same tower is an improvement. The move to 28KW on a taller tower is equivalent to 50KW although the power vs height experts will have to chime in on if that is making the difference you're noticing or if it is just 20 years of increased noise in the FM band.