At 17 years, I'd suggest it is time to OH the carb but would not rule out some other components that are involved, like mags, wires and plugs.
Take-off power at sea level is typically full rich. You can lean it a bit any day and produce more power but at the risk of detonation (some say it is not a concern). Many old A/C POH's promoted this method for take-off (max power) but it is not generally recommended these days unless you are taking off at a sufficiently high DA where you cannot make more than 75% power.
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)