Hmm I guess you will hit only either odd or even delays too in HGSS ID/SID abuse...
For me, I almost always hit odd delays (no way to switch between odd & even except the menu flipping... but that's unavailable during ID/SID abuse).
Only way to switch between odd & even is to change the year by odd number difference from the original.
Yeah, I was hitting odd delays but aiming for an even delay, so I changed the date and time accordingly. The only problem is that my delays have switched from odd to even and has just gone back to odd again... it's really annoying lol. To make matters worse I keep hitting everything around the right delay.