I bundle in core aeration into my 4 and 5 step programs no questions asked. Tight MN clay soil - you have to aerate.
As for SiFi fert - I will be interested in hearing how you sell a season only being on a lawn one or two times per season. A customer is not going to pay double the price around here, simply because you use a high price fert, regardless of how that fert works.
7x14 Stealth SE Enclosed with 48" side ramp
08 Toro Z400 48" deck, 21HP Kaw with EZ Vac twin bag
09 Exmark Turf Tracer HP 36"
21" Toro SR4 Super Recycler
Stihl KM90 Kombi w/ straight shaft trimmer & tiller heads
Husqvarna 125B Blower
Turfco XT5 Aerator
Turfco LS-22 Overseeder
EcoLawn 200 Applicator
I can do all things through Him who gives me strength.