Internet load sharing

Hi,
I want to load share traffic for my two network segments. I have two routers with each internet circuit running BGP with two different ISPs(ISP- A & ISP-B). Also running IBGP between two routers. Since i have two /24 segments(not provided by ISP) so i want one segment to prefer via ISP A & other segment to prefer via ISP B. I have configured EBGP & IBGP and configured AS-path prepend but i see some asymmetric behaviour. Source traffic which prefer via ISP -A is going via it but incoming traffic is via ISP-B.
Pls suggest how this asymmetric behaviour could be fixed.

Hi. Pls see below config. I have ASA configured with ip x.x.x.5 so while tracing from firewall to another location public ip(USA) trace goes to router-A via ISP-A. But when do trace from USA to ASA it goes through ISP-B.
Router-A#
router bgp 132965
bgp log-neighbor-changes
neighbor 14.140.191.181 remote-as 4755 --- ISP- A
neighbor X.X.X.18 remote-as 132965 ---- IBGP
address-family ipv4
network X.X.X.0 mask 255.255.255.0
network Y.Y.Y.0 mask 255.255.255.0
neighbor 14.140.191.181 activate
neighbor 14.140.191.181 soft-reconfiguration inbound
neighbor 14.140.191.181 route-map BGP-add out
neighbor 14.140.191.181 maximum-prefix 1000 1
neighbor X.X.X.18 activate
neighbor X.X.X.18 next-hop-self
neighbor X.X.X.18 soft-reconfiguration inbound
exit-address-family
ip route X.X.X.0 255.255.255.0 Null0 254
ip route Y.Y.Y.0 255.255.255.0 X.X.X.5 name DMZ
ip prefix-list BGP-236 seq 5 permit X.X.X.0/24
ip prefix-list BGP-237 seq 5 permit Y.Y.Y.0/24
route-map BGP-add permit 5
match ip address prefix-list BGP-236
route-map BGP-add permit 10
match ip address prefix-list BGP-237
set as-path prepend 132965 132965 132965 132965
===========================================================
Router-B#
router bgp 132965
bgp log-neighbor-changes
redistribute connected
network X.X.X.0 mask 255.255.255.0
network Y.Y.Y.0 mask 255.255.255.0
neighbor X.X.X.17 remote-as 132965 --- IBGP
neighbor X.X.X.17 next-hop-self
neighbor X.X.X.17 soft-reconfiguration inbound
neighbor 125.19.48.121 remote-as 9498 --- ISP-B
neighbor 125.19.48.121 soft-reconfiguration inbound
neighbor 125.19.48.121 route-map BGP-bhar out
neighbor 125.19.48.121 maximum-prefix 1000 1
ip route Y.Y.Y.0 255.255.255.0 X.X.X.5 name DMZ
ip prefix-list BGP-236 seq 5 permit X.X.X.0/24
ip prefix-list BGP-237 seq 5 permit Y.Y.Y.0/24
route-map BGP-bhar permit 5
match ip address prefix-list BGP-237
route-map BGP-bhar permit 10
match ip address prefix-list BGP-236
set as-path prepend 132965 132965 132965 132965

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