DMVPN fast convergence with ebgp and capacity planning

Hi.
In a dual hub/dual dmvpn design, EBGP is running over the GRE DMVPN tunnel (without ipsec/NO encryption). Once the main hub is down, it takes so long for the spokes to detect the primary hub is down (bgp hold down timer) and then converge to the secondary hub.
Apart from the bgp timers tunning, is there any other way to achieve fast convergence? and without overutilizing resources? (memory/cpu).
The hub routers are ASR1001 and there will be ~70 dmvpns, with ~100 spokes per DMVPN.
Thanks,
Carlos.

Marcin,
After deleting the command "if-state nhrp" from both tunnels, I see that one of the tunel changes it state to up/up and I can recover reachability to the remote hub.
R21#show ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            unassigned      YES NVRAM administratively down down
FastEthernet1/0            172.16.254.3    YES DHCP   up                    up
FastEthernet1/1            unassigned      YES NVRAM administratively down down
Loopback0                  21.21.21.21     YES manual up                    up
Tunnel178                  178.178.178.21 YES NVRAM up                    down
Tunnel179                  179.179.179.21 YES manual up                    up
R21#config t
Enter configuration commands, one per line. End with CNTL/Z.
R21(config)#int tun 178
R21(config-if)#no if
R21(config-if)#no if-state nh
R21(config-if)#no if-state nhrp
R21(config-if)#int tun 179
R21(config-if)#no if-state nhrp
R21(config-if)#
*Jun 27 00:18:06.511: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel178, changed state to up
R21(config-if)#^Z
R21#show ip
*Jun 27 00:18:16.103: %SYS-5-CONFIG_I: Configured from console by console
R21#show ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            unassigned      YES NVRAM administratively down down
FastEthernet1/0            172.16.254.3    YES DHCP   up                    up
FastEthernet1/1            unassigned      YES NVRAM administratively down down
Loopback0                  21.21.21.21     YES manual up                    up
Tunnel178                  178.178.178.21 YES NVRAM up                    up
Tunnel179                  179.179.179.21 YES manual up                    up
R21#show ip nhrp nhs detail
Legend: E=Expecting replies, R=Responding, W=Waiting
Tunnel178:
178.178.178.1   E priority = 0 cluster = 0 req-sent 6 req-failed 0 repl-recv 0 (01:11:41 ago)
Tunnel179:
179.179.179.1 RE priority = 0 cluster = 0 req-sent 1020 req-failed 0 repl-recv 522 (00:00:01 ago)
R21#
From the last output of "show ip nhrp nhs detail" I see only peer from tunel 179 is marked as RE: Responding, Expecting replies. Want to know why the peer from tunel 178 is not also in that state?
I can ping both nbma (physical) and virtual (tunnel) ip address of both hubs.
########## Ping to hub 1 nbma (physical) address:
R21#ping vrf dmvpn 200.0.0.178
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 200.0.0.178, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 200/303/436 ms
########## Ping to hub 2 nbma (physical) address:
R21#ping vrf dmvpn 201.0.0.178
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 201.0.0.178, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 144/220/268 ms
########## Ping to hub 1 virtual (tunnel) address:
R21#ping 178.178.178.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 178.178.178.1, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 164/186/228 ms
########## Ping to hub 2 virtual (tunnel) address:
R21#ping 179.179.179.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 179.179.179.1, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 228/395/560 ms
R21#
R21#show ip nhrp nhs detail
Legend: E=Expecting replies, R=Responding, W=Waiting
Tunnel178:
178.178.178.1   E priority = 0 cluster = 0 req-sent 74 req-failed 0 repl-recv 0 (01:15:08 ago)
Tunnel179:
179.179.179.1 RE priority = 0 cluster = 0 req-sent 1088 req-failed 0 repl-recv 590 (00:00:02 ago)
R21#
Thanks,
Carlos Trujillo.

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