Limit 100mb with rb750gr3 when supply dhcp

Dear all.

I have problem with my 750gr3 like this:
I run dual band 2 pppoe and mix it: 60+150 =210mb

My network connect like this:
Rb750gr3 > 2 router wifi

Problem like this:

  • when i let router wifi don’t supply dhcp (ip). I mean it become just Access point. ( ip supply by rb750gr3) Speed test on wifi is just limit to 100mb

  • my computer also connect direct to 750gr3. Speed same limit 100mb

  • when i let router wifi supply dhcp (ip) as normal. Speed test on wifi is Ok = 210mb

I try with both my router wifi is the same. I dont know problem here!

2 router is : tp-link ac2600 and buffalo wsr1166dhp3 . All wan and Lan are Gigabyte. All cable are cat 5+