Cowboy chrony with Trail Boss powder

[Morne]

Unhappy with the variability of my Red Dot loads I thought I would try switching to Trail Boss since I wanted to also switch primers:

***CHRONY DATA***

47 Degrees F, 61% Relative Humidity, 30.22" Hg

.38 Spl 100-gr LRNFP, Fed-100 SPP, 3.4-gr Trail Boss, 1.379-1.389" COAL
Rossi M92 with 16" barrel
993.6, 956.9, 983.1, 986.6, 974.4, 928.0, 975.1, 965.5, 1012 - AVERAGE = 975.0 fps - ES = 84.0
Taurus Gaucho with 5.5" barrel
813.9, 794.0, 807.6, 816.3, 829.3 - AVERAGE = 812.2 fps - ES = 35.3

.38 Spl 105-gr LSWC, Fed-100 SPP, 3.4-gr Trail Boss, 1.401-1.410" COAL
Rossi M92 with 16" barrel
961.7, 982.0, 982.1, 981.4, 969.2, 923.1, 995.7, 977.3, 949.0, 965.4 - AVERAGE = 968.7 fps - ES = 72.6
Taurus Gaucho with 5.5" barrel
805.7, 783.3, 815.6, 845.0, 785.8 - AVERAGE = 807.1 fps - ES = 61.7

.38 Spl 125-gr LRNFP, Fed-100 SPP, 3.4-gr Trail Boss, 1.402-1.412" COAL
Rossi M92 with 16" barrel
933.0, 934.2, 927.8, 836.1, 897.1, 883.8, 846.9, 918.2, 875.3, 913.8 - AVERAGE = 896.6 fps - ES = 98.1
Taurus Gaucho with 5.5" barrel
658.3, 673.0, 671.7, 673.0, 734.8 - AVERAGE = 682.2 fps - ES = 76.5



While these velocities are acceptable for Cowboy Action Shooting I'm wondering if I shouldn't step up a couple rungs on the ladder and see if I can get a little more consistency as well.