well bob, i use horizontal type. and have made quite a few doors with them.. the key is keeping them down to the cutter.. use a stop on top to keep them from raising up and take more than one cut i have a 3hp router and dont know if a 1.75 will do it.. you need to slow them down when running the larger wings .. carol used a vertical and had her router set up to run horizontal with a metal plate. the smaller vetical bits would use less hp to run effectively.. but drop here aline and she can give you here thoughts beter than i.
If in Doubt, Build it Stout!
One hand washes the other!
Don't put off today till tomorrow!