Good for you for gaining home inspection experience. Definitely a good thing. If that experience allows you to see things that may not be right, the client will appreciate that.
I would just be careful not to present yourself as a home inspector. Just disclosing “I am not a home inspector” might not be enough, especially if you provide opinions that should only be made by a home inspector. Make sure you continue to add, “recommend inspection by a professional qualified in these matters”.
I have been doing FHA appraisals for over 27 years and I am still amazed by FHA appraisers, many with as much experience as me, living in fear that FHA wants them to be equivalent to home inspectors. That is simply not true. All through their guidelines (of what to report) include the words, “observe” and “readily apparent” to define your scope of work. You see no evidence of leaks in the attic and no missing or damaged shingles from looking ON THE GROUND, you can reasonably say the roof has 2 years of life left. You do not have to attest to how many years of life left. If the furnace is on and the pipes are warm, heater works. You do not have to attest to percent efficiency. They want you to report any loose wires, uncovered electrical panels and sparks when you turn on switches. You do not have to attest to if the wires are up to code. Your observation of the support beams as you mentioned is enough. FHA expects nothing more from you. You can relax knowing you are doing a good, professional FHA appraisal.