There may be many reasons for your reverse delay concern. However, if this problem has been evident both prior to and/or after overhaul, then you may solve this by making some modifications to your control valve assembly. This repair should not be attempted by someone that is unfamiliar with this type of work.
This is a fairly common complaint that we at ATSG deal with on a regular basis. If you can provide me with a fax # then I will send some information from our 2001 seminar book dealing specifically with reverse concerns with the 722.3,4,and 5 units.