Breakdown is 160/160/80/60/40, running 25/100/500/1k/5k.
Yeah, I think you need more 1ks for sure. It looks like this set could accommodate 20 stacks of 8/8/4/7 if you added 80-100 T1K chips. Why not forgo the 5K chips and get about 40 5k plaques? 5k makes sense to me as the "plaque" denom in a base T25 set anyway. You could then just introduce the plaques for rebuys, color-ups or deep stack (15K or 20K ) tournaments. Though honestly you probably want more than 40 plaques if you think T20K starting stacks are to be the norm.
But as your breakdown is presently set up All of your chips T25-T5K total T300K, so really T25K plaques don't make a lot of sense, 12 plaques cover the biggest possible tournament you can host with the chips.
But I think you need to decide are you base T25 or T100 on this. T5K plaques for the former, T25K plaques if the latter.
I would suggest the following:
Base T25:
Starting Stack 8/8/4/7 for T10K for 20 players
160/160/80/140 of T25/100/500/1000 for 540 chips and 60 T5K plaques (do all color ups and reentries with plaques)
Base T100:
(I am not as good at Base T100 yet, but based on the couple events I have played)
Starting Stack 10/4/12/7 for T50K for 20 players
200/80/240/140 of T100/500/1000/5000 for 680 chips and 60 T25K plaques (again all color ups and reentries with plaques)
OR for a smaller starting stack (same effective starting stack if 100-100 is the first level)
10/4/7/3 for T25K for 20 players
200/80/140/80 for 500 chips plus 40-60 T25K plaques. (Color up T100 and T500 using T5K chips, rest in plaques)
Personally I find the base T25 arrangement the most pleasing, but of course your mileage may vary.
The main issue is with your breakdown as originally designed is you are too low on T1K chips to the point that breaking T5K chips on the table will prove difficult, and the same is true with not having enough T5K chips to break T25K plaques.